CVE-2026-106492

What it is

Backstage is an open framework for building developer portals. Prior to 0.16.1 and 0.17.8, the @backstage/backend-defaults package is affected by improper preservation of access restrictions during service credential delegation. An external service credential configured with access restrictions (e.g., read-only) could bypass those restrictions by routing requests through plugin delegation paths. This could allow a restricted service to perform operations beyond its intended scope, including write operations on plugins it was restricted to read-only access for. This issue is fixed in versions 0.16.1 and 0.17.8.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of data tampering.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-10-06 18:46 UTC ReservedThe CVE id was reserved by its CNA
2. 2026-10-06 21:17 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-10-22 13:40 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.2% in the next 30 days (EPSS).
• Severity: 7.6 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2026-10-06 21:17 UTC

Last modified

2026-10-22 13:40 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-269 · Improper privilege management

Record status

Analyzed

Affected

• Linuxfoundation backstage\/backend-defaults < 0.16.1
• Linuxfoundation backstage\/backend-defaults < 0.17.8
• Linuxfoundation Backstage < 1.49.6
• Linuxfoundation Backstage < 1.54.6

Attack profile CVSS 3.1 · 7.6

Attack vector

Network

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

Low

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-106492.md and follow it. Check whether this project is affected by CVE-2026-106492. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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