CVE-2026-106556
Backstage: Configuration bypass in TechDocs mkdocs.yml sanitization
Description
Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by configuration bypass in techdocs mkdocs.yml sanitization. Insufficient validation of MkDocs configuration during TechDocs generation could allow an authenticated user who can register or modify documentation sources to execute arbitrary commands in the build environment. Impact is limited to resources accessible to the TechDocs backend or build container. This issue is fixed in versions 1.14.6 and 1.15.4.
INFO
Published Date :
Oct. 7, 2026, 3:17 p.m.
Last Modified :
Oct. 13, 2026, 2:25 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-106556
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update @backstage/plugin-techdocs-node to version 1.14.6 or later.
- Apply patches for affected versions if update is not immediate.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-106556.
| URL | Resource |
|---|---|
| https://github.com/backstage/backstage/commit/25125ee727a3de3418a8fa6a9e458cd5b73ecf26 | Patch |
| https://github.com/backstage/backstage/commit/b6d1aea0bef99b8dfec3c8746032474867ba677a | Patch |
| https://github.com/backstage/backstage/releases/tag/v1.50.5 | Patch Release Notes |
| https://github.com/backstage/backstage/releases/tag/v1.54.6 | Patch Release Notes |
| https://github.com/backstage/backstage/security/advisories/GHSA-g2hj-v2j6-vfvg | Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-106556 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-106556
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-106556 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-106556 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Oct. 13, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* versions up to (excluding) 1.50.5 *cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* versions from (including) 1.51.1 up to (excluding) 1.54.6 *cpe:2.3:a:linuxfoundation:backstage:1.51.0:next0:*:*:*:*:*:* *cpe:2.3:a:linuxfoundation:backstage:1.51.0:next1:*:*:*:*:*:* *cpe:2.3:a:linuxfoundation:backstage:1.51.0:next2:*:*:*:*:*:* *cpe:2.3:a:linuxfoundation:backstage:1.51.0:next3:*:*:*:*:*:* *cpe:2.3:a:linuxfoundation:backstage:1.51.0:-:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node:*:*:*:*:*:*:*:* versions up to (excluding) 1.14.6 *cpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node:*:*:*:*:*:*:*:* versions from (including) 1.15.0 up to (excluding) 1.15.4 Added Reference Type GitHub, Inc.: https://github.com/backstage/backstage/commit/25125ee727a3de3418a8fa6a9e458cd5b73ecf26 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/backstage/backstage/commit/b6d1aea0bef99b8dfec3c8746032474867ba677a Types: Patch Added Reference Type GitHub, Inc.: https://github.com/backstage/backstage/releases/tag/v1.50.5 Types: Patch, Release Notes Added Reference Type GitHub, Inc.: https://github.com/backstage/backstage/releases/tag/v1.54.6 Types: Patch, Release Notes Added Reference Type GitHub, Inc.: https://github.com/backstage/backstage/security/advisories/GHSA-g2hj-v2j6-vfvg Types: Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 07, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-106556', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-10-07T16:15:35.192583Z'} -
New CVE Received by [email protected]
Oct. 07, 2026
Action Type Old Value New Value Added Description Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by configuration bypass in techdocs mkdocs.yml sanitization. Insufficient validation of MkDocs configuration during TechDocs generation could allow an authenticated user who can register or modify documentation sources to execute arbitrary commands in the build environment. Impact is limited to resources accessible to the TechDocs backend or build container. This issue is fixed in versions 1.14.6 and 1.15.4. Added CVSS V3.1 AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L Added CWE CWE-78 Added CWE CWE-184 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/106xxx/CVE-2026-106556.json">CVE-2026-106556</a> Added Reference https://github.com/backstage/backstage/commit/25125ee727a3de3418a8fa6a9e458cd5b73ecf26 Added Reference https://github.com/backstage/backstage/commit/b6d1aea0bef99b8dfec3c8746032474867ba677a Added Reference https://github.com/backstage/backstage/releases/tag/v1.50.5 Added Reference https://github.com/backstage/backstage/releases/tag/v1.54.6 Added Reference https://github.com/backstage/backstage/security/advisories/GHSA-g2hj-v2j6-vfvg