CyberSecBulletin
CVE-2026-106510NVD status: Analyzed

backstage: Permissive List of Allowed Inputs

Published Updated By the CyberSecBulletin desk

CVE-2026-106510 is a high-severity permissive list of allowed inputs vulnerability in backstage, with a CVSS 3.1 base score of 7.7 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. Affected backstage versions: < 1.50.5; >= 1.51.0-next.0, < 1.54.6. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.48% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Backstage Plugin-techdocs-node to 1.14.6 or 1.15.4, whichever matches your release line, or a later version.
  2. Read the advisory on github.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
Backstagebackstage< 1.50.5; >= 1.51.0-next.0, < 1.54.6Not stated
@backstageplugin-techdocs-node< 1.14.6; >= 1.15.0, < 1.15.4Not stated
Linux FoundationBackstage Plugin-techdocs-nodebefore 1.14.6; 1.15.0 up to, but not including, 1.15.41.14.6, 1.15.4

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
HighSuccess depends on conditions outside the attacker's control.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
ChangedThe attack can reach beyond the vulnerable component into other systems.
Confidentiality
HighAll data handled by the component can be read.
Integrity
LowLimited modification of data is possible.
Availability
LowPerformance or availability is reduced.

Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L. Scored by CNA (github.com).

Official description

Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by remote code execution via crafted markdown_extensions in techdocs mkdocs.yml. An authenticated user who can register catalog entities can provide a crafted mkdocs.yml causing arbitrary OS command execution on the TechDocs build host when the docs are built. This issue is fixed in versions 1.14.6 and 1.15.4.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Permissive List of Allowed Inputs

The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are explicitly allowed by policy because the inputs are assumed to be safe, but the list is too permissive - that is, it allows an input that is unsafe, leading to resultant weaknesses.

More Permissive List of Allowed Inputs vulnerabilities (CWE-183)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in backstage

All backstage vulnerabilities

Recent Permissive List of Allowed Inputs vulnerabilities

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