Gitea: Cross-Repository Authorization Bypass via Release Attachment Linking Leads to Private Attachment Disclosure
Priority MEDIUM 48CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub. Impact type from CWE-284.
Summary
Gitea does not properly validate repository ownership when linking attachments to releases. An attachment uploaded to a private repository could potentially be linked to a release in a different public repository, making it accessible to unauthorized users.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00455 39th percentileScored 2026-11-07
Fix Fixed github.com/go-gitea/gitea (Go): 1.25.4
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
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 1.25.3 | — | No fix listed | CNA |
| — | github.com/go-gitea/gitea (Go) | before 1.25.4 | 1.25.4 | Patch available | GHSA-4xx9-vc8v-87hv |
- Gitea Open Source Git Server VendorGitea Affected up to 1.25.3 Fixed in — No fix listed CNA
- github.com/go-gitea/gitea (Go) Vendor— Affected before 1.25.4 Fixed in 1.25.4 Patch available GHSA-4xx9-vc8v-87hv
Remediation
- Fix · GHSA-4xx9-vc8v-87hv github.com/go-gitea/gitea (Go) Fixed in 1.25.4 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Critical. Red Hat's page for this CVE →
Not affected: 1 product
- OpenShift Pipelines
Timeline
- 2026-10-02 Threatist record created from CVE-2026-20912
- 2026-10-03 Alias added: GHSA-4xx9-vc8v-87hv
References
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-2020-11072 The git hook feature in Gitea 1.1.0 through 1.12.5 might allow for authenticated remote… CVSS 3.1HIGH 7.2
- TI-2022-12910 Gitea before 1.16.7 does not escape git fetch remote. CVSS 3.1HIGH 7.5
- TI-2019-08404 models/repo_mirror.go in Gitea before 1.7.6 and 1.8.x before 1.8-RC3 mishandles mirror… CVSS 3.1HIGH 8.8
- TI-2022-00955 Open Redirect on login in go-gitea/gitea CVSS 3.1MEDIUM 6.1
- TI-2026-68968 Push-to-create bypass of FORCE_PRIVATE policy in Gitea CVSS 3.1MEDIUM 5.4
Sources
- CVE-2026-20912 · CVE Program
- CVE-2026-20912 · NVD
- FIRST EPSS
- GHSA-4xx9-vc8v-87hv · GitHub Advisory Database · CC BY 4.0
- CVE-2026-20912 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences