Blind SSRF in OAuth2 avatar synchronization via unvalidated OIDC picture claim
Priority MEDIUM 48CWE-918Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub. Impact type from CWE-918 and the CVSS impact.
Summary
Blind SSRF in OAuth2 avatar synchronization via unvalidated OIDC picture claim
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0029 21st percentileScored 2026-11-07
Fix Fixed code.gitea.io/gitea (Go): 1.27.0
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Gitea | Gitea Open Source Git Server | up to 1.26.4 | — | No fix listed | CNA |
| — | code.gitea.io/gitea (Go) | before 1.27.0 | 1.27.0 | Patch available | GHSA-x77v-q46j-393g |
- Gitea Open Source Git Server VendorGitea Affected up to 1.26.4 Fixed in — No fix listed CNA
- code.gitea.io/gitea (Go) Vendor— Affected before 1.27.0 Fixed in 1.27.0 Patch available GHSA-x77v-q46j-393g
Remediation
- Fix · GHSA-x77v-q46j-393g code.gitea.io/gitea (Go) Fixed in 1.27.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-23603
- 2026-10-03 Alias added: GHSA-x77v-q46j-393g
References
Advisory 1
Other 7
- Gitea v1.27.0 Release
- Gitea v1.27.0 Release Blog Post
- https://github.com/go-gitea/gitea/pull/38406
- https://github.com/go-gitea/gitea/pull/38426
- https://github.com/go-gitea/gitea/commit/de4b8277e9cb576f2315fb03b5ab6478b42a1d31
- https://github.com/go-gitea/gitea/commit/f69e15afe7496cc62e96dab244629c69eb31a7bf
- https://github.com/go-gitea/gitea
More Gitea vulnerabilities
- 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
Sources
- CVE-2026-23603 · CVE Program
- CVE-2026-23603 · NVD
- FIRST EPSS
- GHSA-x77v-q46j-393g · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences