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CVE-2026-53431— Boruta accepts expired JWT client assertions due to missing exp claim validation

Quick assessment

Affected

malach-it boruta

Exploitation

Public or AI PoC available; prioritize validation

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 9.1 · Critical EPSS 0.51% · P43 Updated Jul 31, 2026

Possible ATT&CK Techniques 1 AI

T1110.004 · Credential Stuffing

Affected Version Matrix 2

Vendor	Product	Version Range	Status
malach-it	boruta	`2.3.0< 2.3.7`	affected
		`5bfbe1c5443bffe71cf1bf954bbdff61327d9a83< *`	affected

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I. Basic Information for CVE-2026-53431

Vulnerability Information

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Vulnerability Title

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

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

使用捕获-重放进行的认证绕过

Source: CVE Program / CVE List V5

Vulnerability Title

malach-it boruta 授权问题漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
malach-it	boruta	2.3.0 ~ 2.3.7	`cpe:2.3:a:malach-it:boruta_auth::::::::`
malach-it	boruta	5bfbe1c5443bffe71cf1bf954bbdff61327d9a83 ~ *	`cpe:2.3:a:malach-it:boruta_auth::::::::`

II. Public POCs for CVE-2026-53431

#	POC Description	Source Link	Shenlong Link

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Qwen3.6-35B-A3B · 8527 chars

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III. Intelligence Information for CVE-2026-53431

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Patches & Fixes for CVE-2026-53431 (2)

Vendor Advisories for CVE-2026-53431 (3)

https://www.cve.org/CVERecord?id=CVE-2026-53431

Same Patch Batch · malach-it · 2026-07-30 · 3 CVEs total

CVE-2026-65635	8.3 HIGH	Boruta dynamic client registration allows creation of over-privileged OAuth clients
CVE-2026-54885	6.9 MEDIUM	Server-side request forgery in Boruta OAuth request_uri and OpenID jwks_uri fetching

IV. Related Vulnerabilities

Same product: boruta

Same vendor: malach-it

Same weakness: CWE-294