CVE-2026-88064

What it is

Backstage is an open framework for building developer portals. Prior to 1.14.6 and from 1.15.0 until 1.15.4, the @backstage/plugin-techdocs-node package insufficiently validates mkdocs.yml supplied by an authenticated user who can register or modify a TechDocs source. Unsafe Python YAML tags, markdown_extensions names and configuration, theme options, and extra_templates values can reach the documentation generator and cause unintended code execution. The resulting impact is limited to the files, credentials, network access, and other resources available to the TechDocs backend or build container. This issue is fixed in versions 1.14.6 and 1.15.4.

At a glance

Exploitability

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

Exploit odds

1.2% chance of exploitation in the next 30 days (EPSS).

Fix

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

Timeline

1. 2026-09-09 21:22 UTC ReservedThe CVE id was reserved by its CNA
2. 2026-09-16 15:18 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-10-14 18:02 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.2% in the next 30 days (EPSS).
• Severity: 8.8 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2026-09-16 15:18 UTC

Last modified

2026-10-14 18:02 UTC

Exploit probability

1.2% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Analyzed

Affected

• Linuxfoundation Backstage plugin-techdocs-node < 1.14.6
• Linuxfoundation Backstage plugin-techdocs-node < 1.15.4
• Linuxfoundation Backstage < 1.14.6
• Linuxfoundation Backstage < 1.15.4

Attack profile CVSS 3.1 · 8.8

Attack vector

Network

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

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-2026-88064.md and follow it. Check whether this project is affected by CVE-2026-88064. 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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