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SCA: security update for github.com/authelia/authelia/v4 (GHSA-hjj4-hfjm-fmrj)

medium Tenable Self-Hosted Container Security Plugin ID 442482

Description

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

 - Authelia is an open-source authentication and authorization server providing two-factor authentication and
 single sign-on (SSO) for applications via a web portal. In versions 4.38.0 through 4.39.19, when a user
 authenticates via Basic Auth (i.e via the `Authorization` header with the `Basic` scheme) on the authz
 verification endpoint, Authelia takes the username directly from the `Authorization` header and passes it
 as is to the regulation system for ban checking and attempt recording. LDAP treats usernames case
 insensitively : `john`, `John`, and `JOHN` all bind as the same user. But the regulation SQL queries treat
 the lookup of these values in certain scenarios as case sensitive. This allows each variation of a
 usernames case to have its own ban bucket. Upgrade to 4.39.20 to receive a patch. As a workaround,
 explicitly disable the basic auth mechanism. (CVE-2026-47203)

Solution

Update the github.com/authelia/authelia/v4 library and its related packages to version 4.39.20 or later.

See Also

https://github.com/advisories/GHSA-hjj4-hfjm-fmrj

Plugin Details

Severity: Medium

ID: 442482

Version: Revision 1.6

Type: Local

Family: SCA Checks

Published: 5/30/2026

Updated: 7/2/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.71

Vendor

Vendor Severity: Low

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

CVSS Score Source: CVE-2026-47203

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

CVSS v4

Risk Factor: Medium

Base Score: 6.3

Threat Score: 2.9

Threat Vector: CVSS:4.0/E:P

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/29/2026

Vulnerability Publication Date: 5/29/2026

Reference Information

CVE: CVE-2026-47203