CVE-2026-20912: gitea Improper Access Control
CVSS: 9.1v3.1CriticalModified
AliasesGHSA-4xx9-vc8v-87hvBIT-gitea-2026-20912GHSA-vfmv-f93v-37mwGO-2026-4364
Published 22-01-2026Last modified 15-07-2026
Vulnerability summary
CVE-2026-20912 is a critical (CVSS 9.1) Improper Access Control vulnerability in gitea. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 38.1% of scored vulnerabilities.
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)EPSS score
0.46%
0%100%
Low · -0.01 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 2 · Related 2Timeline
- 22-01-2026PublishedVulnerability first disclosed.
- 15-07-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
3 scores · 3 sources · 2 versionsMedium 5.1Preferred score · OSV · Go (Ecosystem advisory) · calculated from vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:NSourcesSingle source
Critical 9.1Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NSourcesAll 2 agree
- NVDNIST9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS trend
Probability
0.46%
Chance of exploitation in the next 30 days
Percentile
38%
Versus all other CVEs
30-day change
-0.01 pp
From 0.46% on 19-09-2026
19-09-202619-10-2026
EPSS score0.46%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-284Improper Access ControlThe product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
- CWE-639Authorization Bypass Through User-Controlled KeyThe system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
- CWE-283Unverified OwnershipThe product does not properly verify that a critical resource is owned by the proper entity.
Affected systems
Gitea2 products
- gitea< 1.25.4
- gitea open source git server≤ 1.25.3
Code.gitea.io1 product
- gitea< 1.25.4
Github.com/go-gitea1 product
- gitea< 1.25.4
3 vendors · 4 products
References
13 links- blog.gitea.com/release-of-1.25.4/Release Notes
Show all 13 references
- github.com/go-gitea/giteaPACKAGE