CVE-2026-4296 : faille élevée github enterprise server (CVSS 8.8)

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.

Sévérité

Élevée (CVSS 8.8)

Vecteur CVSS

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitation active

Non signalée par la CISA

Publication

21 avr. 2026

Dernière mise à jour

17 juin 2026

• github enterprise server

• Fiche CVE-2026-4296 sur le NVD (NIST)
• docs.github.com/en/[email protected]/admin/release-notes
• docs.github.com/en/[email protected]/admin/release-notes
• docs.github.com/en/[email protected]/admin/release-notes
• docs.github.com/en/[email protected]/admin/release-notes
• docs.github.com/en/[email protected]/admin/release-notes
• docs.github.com/en/[email protected]/admin/release-notes
• docs.github.com/en/[email protected]/admin/release-notes