Medium severity · published Mar 10, 2026
CVE-2026-3306
Improper authorization in GitHub Projects allows modification of issue and pull request metadata without repository write access
4.3
CVSS
0.4%
EPSS
No
On KEV
Description
An improper authorization vulnerability was identified in GitHub Enterprise Server that allowed a user with read access to a repository and write access to a project to modify issue and pull request metadata through the project. When adding an item to a project that already existed, column value updates were applied without verifying the actor's repository write permissions. This vulnerability was reported via the GitHub Bug Bounty program and has been fixed in GitHub Enterprise Server versions 3.14.24, 3.15.19, 3.16.15, 3.17.12, 3.18.6 and 3.19.3.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 31% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ES
Enterprise Server · GitHub
3.14.0 through 3.14.23; 3.15.0 through 3.15.18; 3.16.0 through 3.16.14; 3.17.0 through 3.17.11; 3.18.0 through 3.18.5; 3.19.0 through 3.19.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-3306
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-3306
Release Notes
https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.24
Release Notes
https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.19
Release Notes
https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.15
Release Notes
https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.12
Release Notes
https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.6
Release Notes
https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.3
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