CVE-2026-106505 (CVSS 7.7)

Description

Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package is affected by bypass of mkdocs configuration sanitizer in techdocs backend. Users with the ability to commit changes to a repository that uses TechDocs can circumvent the MkDocs configuration file sanitizer introduced in response to CVE-2026-25153 and execute arbitrary code on the TechDocs backend host during documentation generation. This issue is fixed in versions 1.14.6 and 1.15.4.

Is your site exposed to CVE-2026-106505?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

7.7

HIGH

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L

EPSS — Exploit Prediction

0.0027

Probability of exploitation

0.18%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-426 CWE-426

CWE-436 CWE-436

References

Other References

https://github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b06988c79c9 https://github.com/backstage/backstage/commit/ef92d3d2b76046205c580e7152956514c15640db https://github.com/backstage/backstage/releases/tag/v1.50.5 https://github.com/backstage/backstage/releases/tag/v1.54.6 https://github.com/backstage/backstage/security/advisories/GHSA-p75x-jh7p-ppcx

Frequently Asked Questions

What is CVE-2026-106505? +

Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package is affected by bypass of mkdocs configuration sanitizer in techdocs backend. Users with the ability to commit changes to a repository that uses TechDocs can circumvent the MkDocs configuration file sanitizer introduced in response to CVE-2026-25153 and execute arbitrary code on the TechDocs backend host during documentation generation. This issue is fixed in versions 1.14.6 and 1.15.4. It has a CVSS v3.1 base score of 7.7 (HIGH).

How severe is CVE-2026-106505? +

CVE-2026-106505 has a CVSS v3.1 score of 7.7 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0027, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-106505? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2024-3220

There is a defect in the CPython standard library module “mimetypes” where on Windows the default list of known file …

CVE-2025-26624

Rufus is a utility that helps format and create bootable USB flash drives. A DLL hijacking vulnerability in Rufus 4.6.2208 …

CVE-2025-4971

Broadcom Automic Automation Agent Unix versions < 24.3.0 HF4 and < 21.0.13 HF1 allow low privileged users who have execution …

CVE-2025-0141

An incorrect privilege assignment vulnerability in the Palo Alto Networks GlobalProtect™ App on enables a locally authenticated non administrative user …

CVE-2025-9267

In Seagate Toolkit on Windows a vulnerability exists in the Toolkit Installer prior to versions 2.35.0.6 where it attempts to …

CVE-2023-32266

Untrusted Search Path vulnerability in OpenText™ Application Lifecycle Management (ALM),Quality Center allows Code Inclusion. The vulnerability allows a user to …

CVE-2026-106505