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Vulnerability record · CVE-2026-3307 · published 21 April 2026

CVE-2026-3307: Github enterprise server insecure direct object reference vulnerability

Github · Enterprise Server

An authorization bypass vulnerability was identified in GitHub Enterprise Server that allowed an attacker with admin access on one repository to modify the secret scanning push protection delegated bypass reviewer list on another repository by manipulating the owner_id parameter in the request body. Authorization was verified against the repository in the URL, but the action was applied to a different repository specified in the request body. The impact is limited to assigning existing trusted users as bypass reviewers; it does not allow adding arbitrary external users. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.14.25, 3.15.20, 3.16.16, 3.17.13, 3.18.7, 3.19.4 and 3.20.1. This vulnerability was reported via the GitHub Bug Bounty program.

5.3 CVSS 4.0 Medium EPSS 0.45% · top 63.2% CWE-639 · Insecure direct object reference
5.3CVSS 4.0 base score
0.45%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

Description

An authorization bypass vulnerability was identified in GitHub Enterprise Server that allowed an attacker with admin access on one repository to modify the secret scanning push protection delegated bypass reviewer list on another repository by manipulating the owner_id parameter in the request body. Authorization was verified against the repository in the URL, but the action was applied to a different repository specified in the request body. The impact is limited to assigning existing trusted users as bypass reviewers; it does not allow adding arbitrary external users. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.14.25, 3.15.20, 3.16.16, 3.17.13, 3.18.7, 3.19.4 and 3.20.1. This vulnerability was reported via the GitHub Bug Bounty program.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://docs.github.com/en/[email protected]/admin/release-notes#3.14.25 Release NotesVendor Advisory
https://docs.github.com/en/[email protected]/admin/release-notes#3.15.20 Release NotesVendor Advisory
https://docs.github.com/en/[email protected]/admin/release-notes#3.16.16 Release NotesVendor Advisory
https://docs.github.com/en/[email protected]/admin/release-notes#3.17.13 Release NotesVendor Advisory
https://docs.github.com/en/[email protected]/admin/release-notes#3.18.7 Release NotesVendor Advisory
https://docs.github.com/en/[email protected]/admin/release-notes#3.19.4 Release NotesVendor Advisory
https://docs.github.com/en/[email protected]/admin/release-notes#3.20.1 Release NotesVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-3307), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.