OAuth2 Sign-In Issue in Gitea Affects Deactivated Accounts
CVE-2026-55987

8.1HIGH

Key Information:

Vendor

Gitea

Status
Gitea Open Source Git Server
Vendor
CVE Published:
13 August 2026

What is CVE-2026-55987?

The OAuth2 sign-in process in Gitea inadvertently reactivates user accounts that administrators have deactivated, compromising intended security measures. This issue occurs when using certain authentication sources that don't require refresh tokens, leading to incomplete deactivation. Organizations using Gitea should take caution to ensure that sensitive accounts remain secure and monitor for unintended access through this vulnerability.

Affected Version(s)

Gitea Open Source Git Server 0 <= 1.26.4

References

https://github.com/go-gitea/gitea/security/advisories/GHS...
vendor-advisory
https://github.com/go-gitea/gitea/releases/tag/v1.27.0
release-notes
https://blog.gitea.com/gitea-1.27.0-is-released/
release-notes

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

khoadb175
.