Description
Bytebase 0.12.0 before 1.0.1 contains an authentication bypass vulnerability that allows unauthenticated attackers to log in as any user. The flaw stems from trusting client-supplied GitLab provider configuration in the POST /api/auth/login/GITLAB_SELF_HOST endpoint. Attackers can set instanceUrl to a server they control that returns an active user with a chosen email. Bytebase then issues session tokens for that principal, letting attackers impersonate existing users including the Owner or create new members.
Metrics
CVSS 3.1 9.8/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| bytebase | bytebase | >= 0.12.0, < 1.0.1 |
References
- https://github.com/bytebase/bytebase
- https://github.com/bytebase/bytebase/blob/1.0.0/server/auth.go#L79-L93
- https://github.com/bytebase/bytebase/commit/d69e682243b25b51dd52912a26e2f259b5f3db2d
- https://github.com/bytebase/bytebase/pull/834
- https://github.com/bytebase/bytebase/releases/tag/1.0.1
- https://github.com/bytebase/bytebase/security/advisories/GHSA-5r3p-6rj5-7937
- https://www.vulncheck.com/advisories/bytebase-0.12.0-before-1.0.1-authentication-bypass-via-gitlab-self-hosted-login
Timeline
- Published
- Oct 22, 2026
- Last modified
- Oct 29, 2026
- NVD status
- Deferred