Gitea OAuth2 userinfo private group disclosure to public-only tokens

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-118394
StatePUBLISHED
AssignerGitea
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-01 10:18:36 UTC
Updated2026-11-01 10:18:36 UTC
DescriptionThe OAuth2 userinfo endpoint (`/login/oauth/userinfo`) decided whether to limit the `groups` claim to public organizations by re-parsing the `Authorization` header as an OAuth2 access token instead of using the scope of the credential that authenticated the request. When a public-only OAuth2 token was sent as a query parameter or form field, or a public-only personal access token was used, that scope came back empty and the claim listed the token owner's private organizations, teams and concealed memberships. The disclosure is limited to the owner's organization and team names and memberships; no repository content is exposed. The endpoint now uses the scope of the authenticating token.

Risk And Classification

EPSS: 0.001980000 probability, percentile 0.096040000 (date 2026-11-01)

Problem Types: CWE-200 | CWE-863 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor | CWE-863 CWE-863: Incorrect Authorization

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gitea Gitea affected 1.23.0 28.3.0 semver Not specified

References

ReferenceSourceLinkTags
github.com/go-gitea/gitea/pull/39690 88ee5874-cf24-4952-aea0-31affedb7ff2 github.com
blog.gitea.com/release-of-28.3.0 88ee5874-cf24-4952-aea0-31affedb7ff2 blog.gitea.com
github.com/go-gitea/gitea/pull/39853 88ee5874-cf24-4952-aea0-31affedb7ff2 github.com
github.com/go-gitea/gitea/security/advisories/GHSA-q9gm-9c7q-c5hq 88ee5874-cf24-4952-aea0-31affedb7ff2 github.com
github.com/go-gitea/gitea/releases/tag/v28.3.0 88ee5874-cf24-4952-aea0-31affedb7ff2 github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: https://github.com/N0K0 (en)

CNA: https://github.com/lunny (en)

CNA: https://github.com/silverwind (en)

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