{"id":"EUVD-2026-41619","revision":null,"records":[{"revision":"adc0db348c8345dda2ee1bd531b046eb","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-24451","aliases":[],"title":"Gitea fork synchronization can expose private parent repository data","description":"Gitea 1.26.2 allows fork synchronization to continue after a parent repository changes from public to private, exposing data to a fork that should no longer be authorized.","state":0,"publishedAt":"2026-07-03T20:19:31.362+00:00","modifiedAt":"2026-07-07T17:00:21.477+00:00","affected":[{"ecosystem":"Vendor product","name":"Gitea Open Source Git Server","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Gitea\",\n                    \"product\": \"Gitea Open Source Git Server\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1.26.2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[],"references":["https://github.com/go-gitea/gitea/security/advisories/GHSA-wrf9-r3h7-7x5v","https://github.com/go-gitea/gitea/pull/38151","https://github.com/go-gitea/gitea/releases/tag/v1.26.3","https://blog.gitea.com/release-of-1.26.3-and-1.26.4/"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-24451","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-24451","identifiers":["CVE-2026-24451"]},"retained":false,"historicalAffected":[]},{"revision":"b9ad53d39e774352962b7966392f5733","observedAt":"2026-11-07T06:38:31.532+00:00","statement":{"source":"euvd","id":"EUVD-2026-41619","aliases":["CVE-2026-24451","GHSA-wrf9-r3h7-7x5v"],"title":"Gitea 1.26.2 allows fork synchronization to continue after a parent repository changes from public to private, exposing data to a fork that should no longer be authorized.","description":"Gitea 1.26.2 allows fork synchronization to continue after a parent repository changes from public to private, exposing data to a fork that should no longer be authorized.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5,"severity":null}],"references":["https://github.com/go-gitea/gitea/security/advisories/GHSA-wrf9-r3h7-7x5v","https://github.com/go-gitea/gitea/pull/38151","https://github.com/go-gitea/gitea/releases/tag/v1.26.3","https://blog.gitea.com/release-of-1.26.3-and-1.26.4/"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-41619","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jul 3, 2026, 8:19:31 PM","dateUpdated":"Jul 7, 2026, 5:00:21 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. 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Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-41619","identifiers":["EUVD-2026-41619","CVE-2026-24451","GHSA-wrf9-r3h7-7x5v"]},"retained":false,"historicalAffected":[]},{"revision":"16768fa5ae944a51a0e98bb5bf977225","observedAt":"2026-10-27T06:23:40.774+00:00","statement":{"source":"nvd","id":"CVE-2026-24451","aliases":[],"title":"Gitea 1.26.2 allows fork synchronization to continue after a parent repository changes from public to private, exposing data to a fork that should no longer be authorized.","description":"Gitea 1.26.2 allows fork synchronization to continue after a parent repository changes from public to private, exposing data to a fork that should no longer be authorized.","state":0,"publishedAt":"2026-07-03T21:16:57.28+00:00","modifiedAt":"2026-10-25T15:10:00.147+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · 134c704f-9b21-4f2e-91b3-4a467353bcc0 · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5,"severity":"HIGH"}],"references":["https://blog.gitea.com/release-of-1.26.3-and-1.26.4/","https://github.com/go-gitea/gitea/pull/38151","https://github.com/go-gitea/gitea/releases/tag/v1.26.3","https://github.com/go-gitea/gitea/security/advisories/GHSA-wrf9-r3h7-7x5v"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-24451","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-200","CWE-284"],"productCriteria":[],"sourceDates":{"published":"2026-07-03T21:16:57.280","lastModified":"2026-10-25T15:10:00.147"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. 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As a result, content added during the private period becomes available through the fork repository after synchronization.\n\n### Details\n\nGitea provides the `merge-upstream` API to synchronize a fork with its parent repository.\n\nA typical workflow is:\n\n1. A repository is public.\n2. Another user creates a fork.\n3. The fork owner uses `merge-upstream` to receive updates from the parent repository.\n\nHowever, if the parent repository is later changed from public to private, the synchronization endpoint continues to import new commits from the parent repository into the fork.\n\nIn testing on Gitea 1.26.2, a fork owner who can no longer directly access the parent repository is still able to synchronize newly created commits from the parent repository into the fork by calling `merge-upstream`.\n\nAs a result, commits created after the visibility change can be propagated into the fork through the normal fork synchronization workflow.\n\n### PoC\n\n#### Proof-of-Concept Code\n\nhttps://anonymous.4open.science/r/Gitea_PoC-EC93/4_poc_merge_upstream\n\n#### PoC Details\n\n1. User `alice` creates a public repository `alice/P`.\n2. User `bob` forks the repository, creating `bob/P`.\n3. `alice` changes `alice/P` from public to private.\n4. Verify that `bob` can no longer directly access the parent repository:\n\n```http\nGET /api/v1/repos/alice/P\n```\n\nResponse:\n\n```http\n404 Not Found\n```\n\n```http\nGET /api/v1/repos/alice/P/contents/README.md\n```\n\nResponse:\n\n```http\n404 Not Found\n```\n\n5. While the repository is private, `alice` commits a new file:\n\n```text\nsecret.txt\n```\n\n6. Verify that `bob` cannot directly access the new file from the parent repository:\n\n```http\nGET /api/v1/repos/alice/P/contents/secret.txt\n```\n\nResponse:\n\n```http\n404 Not Found\n```\n\n7. `bob` synchronizes the fork:\n\n```http\nPOST /api/v1/repos/bob/P/merge-upstream\n```\n\nResponse:\n\n```http\n200 OK\n```\n\n8. The newly added file is now available through the fork repository:\n\n```http\nGET /api/v1/repos/bob/P/contents/secret.txt\n```\n\nResponse:\n\n```http\n200 OK\n```\n\nThe attached PoC reproduces the behavior end-to-end.\n\nAs a control test, attempting to access the private-period commit directly through the fork's Git API before synchronization fails:\n\n```http\nGET /api/v1/repos/bob/P/git/commits/<private-period-commit-sha>\n```\n\nResponse:\n\n```http\n404 Not Found\n```\n\nThis indicates that the commit becomes available in the fork only after the `merge-upstream` operation synchronizes it from the parent repository.\n\n### Impact\n\nA fork created while a repository is public can continue receiving updates from the parent repository after the parent repository is changed to private.\n\nConsequently, content committed after the visibility change may become available through fork synchronization even when the fork owner can no longer directly access the parent repository.\n\nThe impact is limited to content that is synchronized from the parent repository into the affected fork. The issue does not allow modification of the parent repository or access to repositories that were never forked.","state":0,"publishedAt":"2026-07-21T21:42:28+00:00","modifiedAt":"2026-07-27T17:11:40.4401095+00:00","affected":[{"ecosystem":"Go","name":"code.gitea.io/gitea","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.26.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/go-gitea/gitea/security/advisories/GHSA-wrf9-r3h7-7x5v","https://nvd.nist.gov/vuln/detail/CVE-2026-24451","https://github.com/go-gitea/gitea/pull/38151","https://blog.gitea.com/release-of-1.26.3-and-1.26.4","https://github.com/go-gitea/gitea","https://github.com/go-gitea/gitea/releases/tag/v1.26.3"],"sourceUrl":"https://github.com/advisories/GHSA-wrf9-r3h7-7x5v","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-wrf9-r3h7-7x5v","identifiers":["GHSA-wrf9-r3h7-7x5v","CVE-2026-24451","GO-2026-6081"]},"retained":false,"historicalAffected":[]},{"revision":"f11d538c6f984929aac16b8852d127fb","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-6081","aliases":["CVE-2026-24451","GHSA-wrf9-r3h7-7x5v"],"title":"Gitea: Fork Synchronization Continues After Parent Repository Changes from Public to Private in code.gitea.io/gitea","description":"Gitea: Fork Synchronization Continues After Parent Repository Changes from Public to Private in code.gitea.io/gitea","state":0,"publishedAt":"2026-07-27T15:32:45+00:00","modifiedAt":"2026-07-27T17:00:26.255776+00:00","affected":[{"ecosystem":"Go","name":"code.gitea.io/gitea","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.26.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/go-gitea/gitea/security/advisories/GHSA-wrf9-r3h7-7x5v","https://nvd.nist.gov/vuln/detail/CVE-2026-24451","https://blog.gitea.com/release-of-1.26.3-and-1.26.4","https://github.com/go-gitea/gitea/pull/38151","https://github.com/go-gitea/gitea/releases/tag/v1.26.3"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-6081","license":"OSV · upstream source license applies","key":"osv:GO-2026-6081","identifiers":["GO-2026-6081","CVE-2026-24451","GHSA-wrf9-r3h7-7x5v"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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