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

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

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.

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不正确的正则表达式

GitHub Enterprise Server 安全漏洞

GitHub Enterprise Server是美国GitHub开源的一个应用软件。提供一个将自己的GitHub实例设置为虚拟设备，从而提供可扩展，易于管理的平台。 GitHub Enterprise Server 3.21之前版本存在安全漏洞，该漏洞源于正则表达式不正确，可能导致攻击者绕过OAuth重定向URI验证，通过特制授权链接将OAuth授权代码重定向至攻击者控制的域。

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