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TI-2026-16817 Aliases CVE-2026-20779GHSA-gx3v-q759-g323

Gitea TOTP single-use enforcement defect allows OTP replay

Priority MEDIUM 64CWE-294Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-294.

Summary

Gitea versions from 1.5.0 before 1.26.3 have a TOTP single-use enforcement defect that allows a valid TOTP code to be accepted more than once across web two-factor authentication flows and the Basic Auth X-Gitea-OTP path.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00492 42nd percentileScored 2026-11-07
Fix Fixed Gitea Open Source Git Server (Gitea): 1.26.3code.gitea.io/gitea (Go): 1.26.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
GiteaGitea Open Source Git Server1.5.0 to before 1.26.31.26.3Patch availableCNA
—code.gitea.io/gitea (Go)1.5.0 to before 1.26.31.26.3Patch availableGHSA-gx3v-q759-g323
  • Gitea Open Source Git Server VendorGitea Affected 1.5.0 to before 1.26.3 Fixed in 1.26.3 Patch available CNA
  • code.gitea.io/gitea (Go) Vendor— Affected 1.5.0 to before 1.26.3 Fixed in 1.26.3 Patch available GHSA-gx3v-q759-g323

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:gitea:gitea:*:*:*:*:*:*:*:*——Gitea
  • cpe:2.3:a:gitea:gitea:*:*:*:*:*:*:*:* Versions — — ·Gitea

Remediation

  • Fix · CNA Gitea Open Source Git Server (Gitea) Fixed in 1.26.3
  • Fix · GHSA-gx3v-q759-g323 code.gitea.io/gitea (Go) Fixed in 1.26.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-20779
  2. 2026-10-03 Alias added: GHSA-gx3v-q759-g323

References

Patch 1

Advisory 2

Other 5

  • TI-2026-42785 Gitea before 1.27.1 allows remote code execution via the diffpatch API through Git hook installation. KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-42033 Improper authorization on OAuth sign-in callback silently re-enables administrator-disabled accounts CVSS 3.1CRITICAL 9.8
  • TI-2026-40842 Privilege Escalation via Access Token Scope Escalation in API CVSS 3.1CRITICAL 9.8
  • TI-2026-16922 Gitea Docker image trusts spoofable reverse-proxy headers by default CVSS 3.1CRITICAL 9.8
  • TI-2026-42043 Team-repository linking endpoint bypasses the RepoAdminChangeTeamAccess organization setting CVSS 3.1CRITICAL 9.1
  • TI-2026-40381 OIDC userinfo Endpoint Returns Identity Claims Without Enforcing API Token Scopes CVSS 3.1CRITICAL 9.1
See all 240 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences