CVE-2026-118394 (GCVE-0-2026-118394)

Vulnerability from cvelistv5 – Published: 2026-11-01 09:48 – Updated: 2026-11-01 09:48
VLAI
Title
Gitea OAuth2 userinfo private group disclosure to public-only tokens
Summary
The 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.
Severity
No CVSS data available.
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-863 - Incorrect Authorization
Assigner
Gitea CNA under the mitre root
CNA scorecard C 61/100 over 185 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Gitea Gitea Affected: 1.23.0 , < 28.3.0 (semver)
guessed Create a notification for this product.
Credits
https://github.com/N0K0 https://github.com/lunny https://github.com/silverwind
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageName": "gitea.dev",
          "product": "Gitea",
          "vendor": "Gitea",
          "versions": [
            {
              "lessThan": "28.3.0",
              "status": "affected",
              "version": "1.23.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "https://github.com/N0K0"
        },
        {
          "lang": "en",
          "type": "analyst",
          "value": "https://github.com/lunny"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "https://github.com/silverwind"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The 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\u0027s private organizations, teams and concealed memberships. The disclosure is limited to the owner\u0027s organization and team names and memberships; no repository content is exposed. The endpoint now uses the scope of the authenticating token."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-200",
              "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
              "lang": "en",
              "type": "CWE"
            },
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-01T09:48:49.431Z",
        "orgId": "88ee5874-cf24-4952-aea0-31affedb7ff2",
        "shortName": "Gitea"
      },
      "references": [
        {
          "name": "GitHub Security Advisory GHSA-q9gm-9c7q-c5hq",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-q9gm-9c7q-c5hq"
        },
        {
          "name": "Fix: go-gitea/gitea pull request #39690",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/go-gitea/gitea/pull/39690"
        },
        {
          "name": "Fix backport to release/v28: go-gitea/gitea pull request #39853",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/go-gitea/gitea/pull/39853"
        },
        {
          "name": "Gitea 28.3.0 release announcement",
          "tags": [
            "release-notes"
          ],
          "url": "https://blog.gitea.com/release-of-28.3.0/"
        },
        {
          "name": "go-gitea/gitea v28.3.0 release",
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/go-gitea/gitea/releases/tag/v28.3.0"
        }
      ],
      "title": "Gitea OAuth2 userinfo private group disclosure to public-only tokens"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "88ee5874-cf24-4952-aea0-31affedb7ff2",
    "assignerShortName": "Gitea",
    "cveId": "CVE-2026-118394",
    "datePublished": "2026-11-01T09:48:49.431Z",
    "dateReserved": "2026-11-01T08:48:41.165Z",
    "dateUpdated": "2026-11-01T09:48:49.431Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-11-04",
      "epss": "0.00149",
      "percentile": "0.04078"
    },
    "nvd": {
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              {
                "defaultStatus": "unaffected",
                "packageName": "gitea.dev",
                "product": "Gitea",
                "vendor": "Gitea",
                "versions": [
                  {
                    "lessThan": "28.3.0",
                    "status": "affected",
                    "version": "1.23.0",
                    "versionType": "semver"
                  }
                ]
              }
            ],
            "source": "88ee5874-cf24-4952-aea0-31affedb7ff2"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "The 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\u0027s private organizations, teams and concealed memberships. The disclosure is limited to the owner\u0027s organization and team names and memberships; no repository content is exposed. The endpoint now uses the scope of the authenticating token."
          }
        ],
        "id": "CVE-2026-118394",
        "lastModified": "2026-11-01T10:18:36.330",
        "metrics": {},
        "published": "2026-11-01T10:18:36.227",
        "references": [
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            "url": "https://github.com/go-gitea/gitea/pull/39853"
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          {
            "source": "88ee5874-cf24-4952-aea0-31affedb7ff2",
            "url": "https://github.com/go-gitea/gitea/releases/tag/v28.3.0"
          },
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            "source": "88ee5874-cf24-4952-aea0-31affedb7ff2",
            "url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-q9gm-9c7q-c5hq"
          }
        ],
        "sourceIdentifier": "88ee5874-cf24-4952-aea0-31affedb7ff2",
        "vulnStatus": "Deferred",
        "weaknesses": [
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                "value": "CWE-200"
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              {
                "lang": "en",
                "value": "CWE-863"
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            ],
            "source": "88ee5874-cf24-4952-aea0-31affedb7ff2",
            "type": "Secondary"
          }
        ]
      }
    }
  }
}



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