CVE-2026-53431

See a problem?
Please try reporting it to the source first.

Source

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

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53431.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-53431

Aliases

EEF-CVE-2026-53431
GHSA-xjv8-vmh5-xhf6

Published

2026-07-30T14:17:27.909Z

Modified

2026-07-31T03:49:05.552119669Z

Severity

9.1 (Critical) CVSS_V4 - 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 CVSS Calculator

Summary

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

Details

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 (clientsecretjwt and privatekeyjwt 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.checkexpiration/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.tokenconfig/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.

Database specific

{
    "cwe_ids": [
        "CWE-294"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53431.json",
    "cna_assigner": "EEF",
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "5bfbe1c5443bffe71cf1bf954bbdff61327d9a83"
                },
                {
                    "fixed": "*"
                }
            ]
        }
    ]
}

References

Affected packages

Git / github.com/malach-it/boruta_auth

Affected ranges

Type

GIT

Repo

https://github.com/malach-it/boruta_auth

Events

Introduced

Fixed

fa474710cfc57abf0ab1374c615cc66df1a05239

Database specific

{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "2.3.0"
        },
        {
            "fixed": "2.3.7"
        }
    ]
}

Affected versions

2.*

2.3.2

2.3.4

2.3.5

2.3.6

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53431.json"