CVE-2026-109553 Gitea - Authentication Bypass

Gitea contains an authentication bypass caused by improper principal resolution in SSH certificate handling, letting attackers authenticate as other users via HTTP signature API and SSH server, exploit requires trusting user certificate authority and accepting arbitrary principals.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.10% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
18 October 2026
Updated
20 October 2026

Vendor fix

Update to the latest version that fixes principal resolution in SSH certificate handling.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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