Gitea (all versions before 1.26.2) + Forgejo (confirmed) CVE‑2026‑27771

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CVE‑2026‑27771 is a recently disclosed high‑severity access control vulnerability affecting the Gitea self‑hosted Git platform.

 Overview

  • Identifier: CVE‑2026‑27771
  • Affected software: Gitea (all versions before 1.26.2) + Forgejo (confirmed)
  • Vulnerability type: Authentication/authorization bypass
  • Severity: ~CVSS 8.2 (High)
  • Disclosed: May 2026

 What the vulnerability does

The flaw allows unauthenticated remote attackers to:
👉 Pull private container images from affected Gitea instances
👉 Without any credentials, account, or token
This happens because Gitea’s container registry:
  • Fails to enforce authentication on “private” repositories
  • Still serves image data to anonymous API requests

 Technical root cause

  • Access control logic in the container registry is flawed
  • The system does not properly validate repository visibility (private/public)
  • Anonymous (“ghost”) users can still access protected endpoints
Attackers can simply:
  • Use standard Docker / OCI pull requests
  • Query endpoints like /v2/<repo>/manifests/ and /blobs/
  • Retrieve images as if they were public
No exploit sophistication required.

 Impact

This is serious because container images often contain:
  • Source code
  • API keys and tokens
  • Database credentials
  • Internal configs / infrastructure details
Exposure can lead to:
  • Data exfiltration
  • Credential compromise
  • Lateral movement in environments
  • Full infrastructure compromise in worst cases

 Scope of exposure

  • ~31,000+ internet-facing instances affected
  • Across 30+ countries
  • Present for ~4 years before discovery
Industries impacted include:
  • Healthcare
  • Aerospace
  • Retail
  • ISPs
  • Enterprise software environments

 Exploitation status

  • No confirmed widespread active exploitation (as of disclosure)
  • Public PoC scripts exist (GitHub / exploit repos)
  • Exploit is trivial due to lack of auth requirement

 Mitigation / Fix

🔴 Immediate action

  • Upgrade to Gitea v1.26.2 or later (patch released May 2026)

🟡 Temporary workaround

If patching is not possible:
[service]
REQUIRE_SIGNIN_VIEW = true
  • Forces authentication for all access
  • But breaks anonymous/public access use cases

 Key takeaway

CVE‑2026‑27771 is a high-risk, low-complexity vulnerability:
  • ✅ No authentication required
  • ✅ Easy to exploit remotely
  • ❗ Direct exposure of sensitive DevOps artifacts
👉 If you run Gitea with the container registry enabled, patch immediately and assume possible historical exposure.

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