An incorrect authorization vulnerability was identified in GitHub Enterprise Server that allowed a user-to-server token scoped to a GitHub App installation to perform certain write operations on public repositories outside the token's intended scope. This was possible because the authorization check only verified that the installation had read permissions on the target repository rather than verifying that the token's installation was explicitly granted access to that repository. An attacker who obtained a victim's user-to-server token could create issues, issue comments, commit comments, and private vulnerability reports on any public repository, appearing as the victim user with no indication of the app involvement. This vulnerability was fixed by adding a repository scope check for user-to-server tokens issued by global apps. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.21.2, 3.20.4, 3.19.8, 3.18.11, 3.17.17, 3.16.20. This vulnerability was reported via the GitHub Bug Bounty program.
Metrics
Affected Vendors & Products
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History
Thu, 02 Jul 2026 16:30:00 +0000
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ssvc
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Thu, 02 Jul 2026 04:00:00 +0000
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Github
Github enterprise Server |
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Github
Github enterprise Server |
Wed, 01 Jul 2026 21:15:00 +0000
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| Description | An incorrect authorization vulnerability was identified in GitHub Enterprise Server that allowed a user-to-server token scoped to a GitHub App installation to perform certain write operations on public repositories outside the token's intended scope. This was possible because the authorization check only verified that the installation had read permissions on the target repository rather than verifying that the token's installation was explicitly granted access to that repository. An attacker who obtained a victim's user-to-server token could create issues, issue comments, commit comments, and private vulnerability reports on any public repository, appearing as the victim user with no indication of the app involvement. This vulnerability was fixed by adding a repository scope check for user-to-server tokens issued by global apps. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.21.2, 3.20.4, 3.19.8, 3.18.11, 3.17.17, 3.16.20. This vulnerability was reported via the GitHub Bug Bounty program. | |
| Title | An incorrect authorization vulnerability in GitHub Enterprise Server allows issue creation in unrelated public repositories | |
| Weaknesses | CWE-863 | |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_P
Published:
Updated: 2026-07-02T15:54:43.817Z
Reserved: 2026-07-01T13:42:35.041Z
Link: CVE-2026-14340
Updated: 2026-07-02T15:10:44.207Z
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OpenCVE Enrichment
Updated: 2026-07-02T18:30:05Z