Detections
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Echo: authlib: security update to 1.6.6+echo.1

critical Tenable Cloud Security Plugin ID 462095

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a JWK
 Header Injection vulnerability in authlib's JWS implementation allows an unauthenticated attacker to forge
 arbitrary JWT tokens that pass signature verification. When key=None is passed to any JWS deserialization
 function, the library extracts and uses the cryptographic key embedded in the attacker-controlled JWT jwk
 header field. An attacker can sign a token with their own private key, embed the matching public key in
 the header, and have the server accept the forged token as cryptographically valid — bypassing
 authentication and authorization entirely. This issue has been patched in version 1.6.9. (CVE-2026-27962)

Solution

Update the authlib library and its related packages to version 1.6.6+echo.1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-27962

Plugin Details

Severity: Critical

ID: 462095

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/3/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.42

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N

CVSS Score Source: CVE-2026-27962

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 8.2

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/19/2026

Vulnerability Publication Date: 3/16/2026

Reference Information

CVE: CVE-2026-27962