--- title: "joserfc - Authentication Bypass" description: "joserfc < 1.7.4 contains an authentication bypass caused by accepting JWS General JSON Serialization with an empty signatures array in jws.deserialize_json(), letting attackers supply arbitrary payloads treated as authentic, exploit requires crafted JWS General JSON input." url: https://panop.io/threat-heartbeat/CVE-2026-102946/ --- # CVE-2026-102946 joserfc - Authentication Bypass joserfc < 1.7.4 contains an authentication bypass caused by accepting JWS General JSON Serialization with an empty signatures array in jws.deserialize\_json(), letting attackers supply arbitrary payloads treated as authentic, exploit requires crafted JWS General JSON input. CVSS base score 9.1 /10 Critical CISA KEV Not listed Public exploit None known Authentication Not required [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-102946) ## Details Type Broken Authentication Impact Broken Authentication CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Published 15 October 2026 Updated 16 October 2026 Weakness [CWE-290](https://cwe.mitre.org/data/definitions/290.html) ## Vendor fix Upgrade to version 1.7.4 or later. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-102946](https://nvd.nist.gov/vuln/detail/CVE-2026-102946) - [https://github.com/authlib/joserfc/releases/tag/1.7.4](https://github.com/authlib/joserfc/releases/tag/1.7.4) - [https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2](https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2) - [https://github.com/authlib/joserfc/commit/f409f8f058225d7686acab6546c94593e4c1bfbe](https://github.com/authlib/joserfc/commit/f409f8f058225d7686acab6546c94593e4c1bfbe) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)