Detections
Analytics

SCA: security update for @backstage/plugin-auth-backend (GHSA-qp4c-xg64-7c6x)

medium Tenable Self-Hosted Container Security Plugin ID 438689

Description

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

 - Backstage is an open framework for building developer portals. Prior to 0.27.1, a Server-Side Request
 Forgery (SSRF) vulnerability exists in @backstage/plugin-auth-backend when
 auth.experimentalClientIdMetadataDocuments.enabled is set to true. The CIMD metadata fetch validates the
 initial client_id hostname against private IP ranges but does not apply the same validation after HTTP
 redirects. The practical impact is limited. The attacker cannot read the response body from the internal
 request, cannot control request headers or method, and the feature must be explicitly enabled via an
 experimental flag that is off by default. Deployments that restrict allowedClientIdPatterns to specific
 trusted domains are not affected. Patched in @backstage/plugin-auth-backend version 0.27.1.
 (CVE-2026-32236)

Solution

Update the @backstage/plugin-auth-backend library and its related packages to version 0.27.1 or later.

See Also

https://github.com/advisories/GHSA-qp4c-xg64-7c6x

Plugin Details

Severity: Medium

ID: 438689

Version: Revision 1.14

Type: Local

Family: SCA Checks

Published: 3/12/2026

Updated: 7/20/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.73

Vendor

Vendor Severity: Low

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-32236

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: 1.7

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 3/12/2026

Vulnerability Publication Date: 3/12/2026

Reference Information

CVE: CVE-2026-32236

cwe: CWE-918