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CVE-2026-4296: Incorrect Regular Expression vulnerability in GitHub Enterprise Server allowed unauthorized access to user accounts via OAuth callback URL validation bypass

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-21 · updated 2026-10-26
• Weakness: CWE-185

Description

An incorrect regular expression vulnerability was identified in GitHub Enterprise Server that allowed an attacker to bypass OAuth redirect URI validation. An attacker with knowledge of a first-party OAuth application's registered callback URL could craft a malicious authorization link that, when clicked by a victim, would redirect the OAuth authorization code to an attacker-controlled domain. This could allow the attacker to gain unauthorized access to the victim's account with the scopes granted to the OAuth application. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.1, 3.19.5, 3.18.8, 3.17.14, 3.16.17, 3.15.21, 3.14.26. This vulnerability was reported via the GitHub Bug Bounty program.

Affected products

• GitHub Enterprise Server: before 3.14.26; from 3.15.0 before 3.15.21; from 3.16.0 before 3.16.17; from 3.17.0 before 3.17.14; from 3.18.0 before 3.18.8; from 3.19.0 before 3.19.5 — fixed in 3.14.26, 3.15.21, 3.16.17, 3.17.14, 3.18.8, 3.19.5

How to fix

Upgrade to a fixed version: GitHub Enterprise Server 3.14.26, 3.15.21, 3.16.17, 3.17.14. Check the vendor advisory for mitigations.

References

• https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.26
• https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.21
• https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.17
• https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.14
• https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.8
• https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.5
• https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.1

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