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CVE-2026-26247

Gitea versions before 1.25.5 do not persist the OAuth2 PKCE S256 challenge method correctly during authorization, allowing token exchange without the expected verifier check.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:74c30d953ebcdf406f58df8f0e054fc9c57974e822c051fa6842ed5df48731b6
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"Gitea Open Source Git Server","vendor":"Gitea","versions":[{"lessThan":"1.25.5","status":"affected","version":"0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:59f9e92cb8d958303c12c64c02f905ebe9dbd7d63deada0a297c1a70b05d62fc · sha256:53d5c830c6a5f6a4… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:59f9e92cb8d958303c12c64c02f905ebe9dbd7d63deada0a297c1a70b05d62fc · sha256:53d5c830c6a5f6a4… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-284","description":"CWE-284","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:59f9e92cb8d958303c12c64c02f905ebe9dbd7d63deada0a297c1a70b05d62fc · sha256:53d5c830c6a5f6a4… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"Gitea v1.25.5 Release Blog Post","tags":["release-notes"],"url":"https://blog.gitea.com/release-of-1.25.5/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:59f9e92cb8d958303c12c64c02f905ebe9dbd7d63deada0a297c1a70b05d62fc · sha256:53d5c830c6a5f6a4… · /containers/cna/references/3
{"name":"GitHub Pull Request #36462","tags":["patch"],"url":"https://github.com/go-gitea/gitea/pull/36462"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:59f9e92cb8d958303c12c64c02f905ebe9dbd7d63deada0a297c1a70b05d62fc · sha256:53d5c830c6a5f6a4… · /containers/cna/references/0
{"name":"GitHub Pull Request #36477","tags":["patch"],"url":"https://github.com/go-gitea/gitea/pull/36477"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:59f9e92cb8d958303c12c64c02f905ebe9dbd7d63deada0a297c1a70b05d62fc · sha256:53d5c830c6a5f6a4… · /containers/cna/references/1
{"name":"Gitea v1.25.5 Release","tags":["release-notes"],"url":"https://github.com/go-gitea/gitea/releases/tag/v1.25.5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:59f9e92cb8d958303c12c64c02f905ebe9dbd7d63deada0a297c1a70b05d62fc · sha256:53d5c830c6a5f6a4… · /containers/cna/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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