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Not in CISA KEV
LOW severity

CVE-2026-23603

LOW

CVE-2026-23603 is a low-severity (CVSS 3.1) Server-Side Request Forgery (SSRF) vulnerability in code.gitea.io/gitea. O3 Security confirms whether CVE-2026-23603 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Blind SSRF in OAuth2 avatar synchronization via unvalidated OIDC picture claim

Also known asGHSA-x77v-q46j-393gGO-2026-6083
Published
Aug 13, 2026
Updated
Aug 27, 2026
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Aug 27, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

  • CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-23603.

Real-World Exposure

1 pkg affected
🐹code.gitea.io/gitea

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Blind SSRF in OAuth2 avatar synchronization via unvalidated OIDC picture claim

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gocode.gitea.io/giteaall versions1.27.0

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for code.gitea.io/gitea. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update code.gitea.io/gitea to 1.27.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-23603 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether CVE-2026-23603 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to CVE-2026-23603. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

Blind SSRF in OAuth2 avatar synchronization via unvalidated OIDC picture claim
O3 Security · Impact-Aware SCA

Is CVE-2026-23603 in your dependencies?

O3 detects CVE-2026-23603 across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.