CVE-2026-53431— malach-it boruta 授权问题漏洞

Boruta accepts expired JWT client assertions due to missing exp claim validation

Authentication Bypass by Capture-replay vulnerability in malach-it Boruta allows an attacker who has obtained a previously valid JWT client assertion to authenticate as the issuing OAuth client after the assertion has expired. Boruta accepts JWT-based client authentication (client_secret_jwt and private_key_jwt token endpoint authentication methods) but never enforces that the assertion's exp claim is in the future. The pre-check helper Boruta.Oauth.Request.Base.check_expiration/1 in lib/boruta/oauth/request/base.ex only verifies that an exp claim is present (it pattern-matches on the existence of the key and returns success), and the Joken token configuration used for signature verification, Boruta.Oauth.Authorization.Client.Token.token_config/0 in lib/boruta/oauth/authorization/client.ex, returns an empty map, so Joken's default exp claim validator is not engaged either. Any attacker who obtains a validly-signed client assertion (for example through logs, reverse proxies, browser tooling, or other observability surfaces) can replay it indefinitely to authenticate as the client and obtain access tokens with that client's privileges. This issue affects boruta: from 2.3.0 before 2.3.7.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

使用捕获-重放进行的认证绕过

malach-it boruta 授权问题漏洞

malach-it Boruta是malach-it组织开源的一个OAuth 2.0 和 OpenID Connect 提供程序的核心。 malach-it boruta 2.3.0版本至2.3.7之前版本存在授权问题漏洞，该漏洞源于对JWT的exp声明验证不当，攻击者可利用已获取的有效JWT客户端断言进行重放攻击，绕过身份认证，获取访问令牌。

N/A

N/A