{"id":"GHSA-v479-vf79-mg83","revision":null,"records":[{"revision":"7d24f801e5a4461fa69ab35ca3d68857","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-40103","aliases":[],"title":"Vikunja's Scoped API tokens with projects.background permission can delete project backgrounds","description":"Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, Vikunja's scoped API token enforcement for custom project background routes is method-confused. A token with only projects.background can successfully delete a project background, while a token with only projects.background_delete is rejected. This is a scoped-token authorization bypass. This vulnerability is fixed in 2.3.0.","state":0,"publishedAt":"2026-04-10T16:12:27.603+00:00","modifiedAt":"2026-04-15T14:45:18.303+00:00","affected":[{"ecosystem":"Vendor product","name":"vikunja","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"go-vikunja\",\n                    \"product\": \"vikunja\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 2.3.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","score":4.3,"severity":"MEDIUM"}],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v479-vf79-mg83","https://github.com/go-vikunja/vikunja/pull/2584","https://github.com/go-vikunja/vikunja/commit/6a0f39b252a81fa4b19dc56dc889183acc9225ae","https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-40103","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-40103","identifiers":["CVE-2026-40103"]},"retained":false,"historicalAffected":[]},{"revision":"9e2ec0e9641f488d9cb015ce28ed42af","observedAt":"2026-10-28T05:00:54.755+00:00","statement":{"source":"euvd","id":"EUVD-2026-21494","aliases":["CVE-2026-40103","GHSA-v479-vf79-mg83"],"title":"Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, Vikunja's scoped API token enforcement for custom project background routes is method-confused. A token with only projects.background can successfully delete a …","description":"Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, Vikunja's scoped API token enforcement for custom project background routes is method-confused. A token with only projects.background can successfully delete a project background, while a token with only projects.background_delete is rejected. This is a scoped-token authorization bypass. This vulnerability is fixed in 2.3.0.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","score":4.3,"severity":null}],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v479-vf79-mg83","https://github.com/go-vikunja/vikunja/pull/2584","https://github.com/go-vikunja/vikunja/commit/6a0f39b252a81fa4b19dc56dc889183acc9225ae","https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-21494","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Apr 10, 2026, 4:12:27 PM","dateUpdated":"Apr 15, 2026, 2:45:18 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-21494","identifiers":["EUVD-2026-21494","CVE-2026-40103","GHSA-v479-vf79-mg83"]},"retained":false,"historicalAffected":[]},{"revision":"2f7e91a044bc491caeaea16437ac1895","observedAt":"2026-10-27T10:09:56.341+00:00","statement":{"source":"nvd","id":"CVE-2026-40103","aliases":[],"title":"Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, Vikunja's scoped API token enforcement for custom project background routes is method-confused. A token with only projects.background can successfully delete a …","description":"Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, Vikunja's scoped API token enforcement for custom project background routes is method-confused. A token with only projects.background can successfully delete a project background, while a token with only projects.background_delete is rejected. This is a scoped-token authorization bypass. This vulnerability is fixed in 2.3.0.","state":0,"publishedAt":"2026-04-10T17:17:13.143+00:00","modifiedAt":"2026-10-26T21:10:00.17+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","score":4.3,"severity":"MEDIUM"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","score":5.4,"severity":"MEDIUM"}],"references":["https://github.com/go-vikunja/vikunja/commit/6a0f39b252a81fa4b19dc56dc889183acc9225ae","https://github.com/go-vikunja/vikunja/pull/2584","https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0","https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v479-vf79-mg83"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-40103","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-836"],"productCriteria":["cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-04-10T17:17:13.143","lastModified":"2026-10-26T21:10:00.170"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-40103","identifiers":["CVE-2026-40103"]},"retained":false,"historicalAffected":[]},{"revision":"ee1af8311b194e1ab1ef855509438858","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-v479-vf79-mg83","aliases":["CVE-2026-40103","GO-2026-5650"],"title":"Vikunja: Scoped API tokens with projects.background permission can delete project backgrounds","description":"### Summary\n\nVikunja's scoped API token enforcement for custom project background routes is method-confused. A token with only `projects.background` can successfully delete a project background, while a token with only `projects.background_delete` is rejected.\n\nThis is a scoped-token authorization bypass.\n\n### Details\n\nI verified this locally on commit `c5450fb55f5192508638cbb3a6956438452a712e`.\n\nRelevant code paths:\n* `pkg/models/api_routes.go`\n* `pkg/routes/routes.go`\n* `pkg/modules/background/handler/background.go`\n\nRoute registration exposes separate permissions for the same path:\n* `GET /api/v1/projects/:project/background` -> `projects.background`\n* `DELETE /api/v1/projects/:project/background` -> `projects.background_delete`\n\nAt enforcement time, `CanDoAPIRoute()` falls back to the parent group and reconstructs the child permission from the path segments only. For the DELETE request, that becomes `background`, so the matcher accepts any token containing `projects.background` without re-checking the HTTP method or matching the stored route detail.\n\nThis matters because `RemoveProjectBackground()` is a real destructive operation:\n* It checks project update rights.\n* It deletes the background file if present.\n* It clears the project's `BackgroundFileID`.\n\n### PoC\n\n1. Log in as a user who can update a project that already has a background.\n2. Create an API token with only:\n   `{\"projects\":[\"background\"]}`\n3. Send:\n   `DELETE /api/v1/projects/<project_id>/background`\n   `Authorization: Bearer <token>`\n4. Observe that the request succeeds and the project background is removed.\n\n**For comparison:**\n1. Create an API token with only:\n   `{\"projects\":[\"background_delete\"]}`\n2. Repeat the same DELETE request.\n3. Observe that the request is rejected with `401 Unauthorized`.\n\nI confirmed this locally with three validations:\n1. `/api/v1/routes` advertises both `background` and `background_delete`.\n2. The matcher unit test proves `CanDoAPIRoute()` accepts DELETE for `background`.\n3. The webtest proves a real API token with only `background` successfully deletes the background.\n\n### Impact\n\nScoped API tokens can exceed their intended capability. A token intended for project background access can delete project backgrounds, which weakens the trust model for automation and third-party integrations that rely on narrowly scoped tokens.\n\nThe attacker needs a valid API token created by a user who has update rights on the target project, but the token itself only needs the weaker `projects.background` permission.","state":0,"publishedAt":"2026-04-10T15:36:47+00:00","modifiedAt":"2026-06-25T23:11:19.763838+00:00","affected":[{"ecosystem":"Go","name":"code.vikunja.io/api","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.3.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v479-vf79-mg83","https://nvd.nist.gov/vuln/detail/CVE-2026-40103","https://github.com/go-vikunja/vikunja/pull/2584","https://github.com/go-vikunja/vikunja/commit/6a0f39b252a81fa4b19dc56dc889183acc9225ae","https://github.com/go-vikunja/vikunja","https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0"],"sourceUrl":"https://github.com/advisories/GHSA-v479-vf79-mg83","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-v479-vf79-mg83","identifiers":["GHSA-v479-vf79-mg83","CVE-2026-40103","GO-2026-5650"]},"retained":false,"historicalAffected":[]},{"revision":"584d71d089cd4624aa6f8787eefd52fa","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5650","aliases":["CVE-2026-40103","GHSA-v479-vf79-mg83"],"title":"Vikunja: Scoped API tokens with projects.background permission can delete project backgrounds in code.vikunja.io/api","description":"Vikunja: Scoped API tokens with projects.background permission can delete project backgrounds in code.vikunja.io/api.\n\nNOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.\n\n(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)\n\nThe additional affected modules and versions are: code.vikunja.io/api before v2.3.0.","state":0,"publishedAt":"2026-06-25T22:34:38+00:00","modifiedAt":"2026-06-25T23:01:37.3568436+00:00","affected":[{"ecosystem":"Go","name":"code.vikunja.io/api","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v479-vf79-mg83","https://nvd.nist.gov/vuln/detail/CVE-2026-40103","https://github.com/go-vikunja/vikunja/commit/6a0f39b252a81fa4b19dc56dc889183acc9225ae","https://github.com/go-vikunja/vikunja/pull/2584","https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5650","license":"OSV · upstream source license applies","key":"osv:GO-2026-5650","identifiers":["GO-2026-5650","CVE-2026-40103","GHSA-v479-vf79-mg83"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-10-30T01:48:55.4491357+00:00","complete":true,"records":1764,"lastAttemptAt":"2026-10-30T01:48:55.4491357+00:00","lastSuccessAt":"2026-10-30T01:48:55.6546169+00:00","error":null,"lastVerifiedAt":"2026-10-30T01:48:55.6546176+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-7e2c4e7288f2c464ad8c61f3bb6017374714faedcc781283ac06a706ee1a820b-8739c76e681f900923b900c9df0ef75cf421d39cabb54650c4b9ad19b6a76d85","complete":true,"records":416807,"lastAttemptAt":"2026-10-30T01:48:54.7743429+00:00","lastSuccessAt":"2026-10-30T00:54:38.6858592+00:00","error":null,"lastVerifiedAt":"2026-10-30T01:48:54.7743429+00:00","snapshotPublishedAt":"2026-10-30T01:29:33+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-824f5092797940c08129032fcab8f0dd","complete":false,"records":13504,"lastAttemptAt":"2026-10-30T02:01:05.0861472+00:00","lastSuccessAt":"2026-10-30T02:01:05.08+00:00","error":"9 identifier lookups failed; latest failures include HTTP 403. Other identifiers were checked independently.","lastVerifiedAt":"2026-10-30T02:01:05.08+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13547,"expectedIdentifiers":13587,"failedIdentifiers":9},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-10-30T01:48:55.4491357+00:00","complete":true,"records":1094,"lastAttemptAt":"2026-10-30T01:48:55.4491357+00:00","lastSuccessAt":"2026-10-30T01:48:55.6554576+00:00","error":null,"lastVerifiedAt":"2026-10-30T01:48:55.6554578+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-c39f89b50d5243318487ad216daf7ffb","complete":true,"records":13527,"lastAttemptAt":"2026-10-30T01:48:56.2261206+00:00","lastSuccessAt":"2026-10-29T22:50:37.74+00:00","error":null,"lastVerifiedAt":"2026-10-29T22:50:37.74+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13587,"expectedIdentifiers":13587,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-9016081e9e88f5929902343d85df87c5c4a1486b10ab07bc6c4f53f98f358871","complete":true,"records":9806,"lastAttemptAt":"2026-10-30T01:48:55.2317852+00:00","lastSuccessAt":"2026-10-29T17:17:25.9359141+00:00","error":null,"lastVerifiedAt":"2026-10-30T01:48:55.2317852+00:00","snapshotPublishedAt":"2026-10-29T16:48:29+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-2de9ccc5290f060c7aa63f89c25dd76f655a64ba1aba7c05c97fa3bee4f09899","complete":true,"records":1967,"lastAttemptAt":"2026-10-30T01:48:54.9356382+00:00","lastSuccessAt":"2026-10-28T20:55:34.2982937+00:00","error":null,"lastVerifiedAt":"2026-10-30T01:48:54.9356382+00:00","snapshotPublishedAt":"2026-10-28T20:03:08+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-5221f6b645588be0464ab0e16e8adfe42d1ccd8f841048d2bd4d0c1cf79fd6b1","complete":true,"records":3014,"lastAttemptAt":"2026-10-30T01:48:55.4168216+00:00","lastSuccessAt":"2026-10-30T00:54:54.6624163+00:00","error":null,"lastVerifiedAt":"2026-10-30T01:48:55.4168216+00:00","snapshotPublishedAt":"2026-10-30T00:48:06+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-ec5b13e78c39945726a720832da7660d2774969f16e2a34f99460c135811abd5","complete":true,"records":230948,"lastAttemptAt":"2026-10-30T01:48:55.0481567+00:00","lastSuccessAt":"2026-10-29T22:50:35.0693267+00:00","error":null,"lastVerifiedAt":"2026-10-30T01:48:55.0481567+00:00","snapshotPublishedAt":"2026-10-29T22:33:13+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}