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Fencer Vulns
critical 9.1

CVE-2026-55982 json

OIDC userinfo Endpoint Returns Identity Claims Without Enforcing API Token Scopes

published 2026-07-21 3 mo ago modified 2026-08-26 2 mo ago also GHSA-mg4f-x9v4-6h2p , GO-2026-6065 , EUVD-2026-58138

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

OIDC userinfo Endpoint Returns Identity Claims Without Enforcing API Token Scopes

Patch / fix

  • go code.gitea.io/gitea 1.27.0
  • go gitea.dev 1.27.0
  • govulncheck-vulndb SLES 16.0, SLES for SAP applications 16.0 0.0.20260727T201416-160000.1.1

suse advisories SUSE-SU-2026:23216-1SUSE-SU-2026:23227-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260727T201416-160000.1.1

opensuse advisories openSUSE-SU-2026:21551-1

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/go-gitea/gitea/security/advisories/GHSA-mg4f-x9v4-6h2p referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
go code.gitea.io/gitea
<1.27.0
1.27.0
go gitea.dev
<1.27.0
1.27.0

Affected products

  • Gitea Gitea Open Source Git Server

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.