CVE-2026-25153Network attack vector

Authenticated code execution via MkDocs hooks

Published Jan 30, 2026 · Updated Jan 30, 2026

Code injection in Backstage TechDocs before 1.13.11 and in 1.14.0 allows remote authenticated users to execute Python code. The TechDocs generator passes repository-controlled mkdocs.yml hooks to MkDocs, which imports and runs the referenced Python hook files on the build server. Exploitation requires permission to submit or modify a processed repository and a TechDocs generator configured with runIn local; execution affects the build server.

CVSS severity7.7
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Backstage TechDocs before 1.13.11 and in 1.14.0 allows remote authenticated users to execute Python code. The TechDocs generator passes repository-controlled mkdocs.yml hooks to MkDocs, which imports and runs the referenced Python hook files on the build server. Exploitation requires permission to submit or modify a processed repository and a TechDocs generator configured with runIn local; execution affects the build server.

The record

CVE
CVE-2026-25153
Published
Jan 30, 2026
Updated
Jan 30, 2026
Vendor
Backstage
Product
Backstage
Classifications
CWE-94, T1059.006
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.13.11
  2. Affected versionversion== 1.14.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Backstage · Backstageversion=< 1.13.11; version== 1.14.0

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.7GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L
7.7Red HatCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.006Command and Scripting Interpreter: Python

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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