Cyber Resilience

CVE-2026-106505

Linuxfoundation Backstage ≤ 1.50.5

Published
06 October 2026
Modified
09 October 2026
Patch / advisory
View advisory
CVSS Score v3.1 7.7
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L
EPSS Score 0.0031 22th percentile
Risk Priority 53 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2026-106505 is a high-severity Untrusted Search Path (CWE-426) vulnerability in Linuxfoundation Backstage. Its CVSS base score is 7.7 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Path Interception by Unquoted Path (T1574.009); ranked at the 22th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to CM-6 (Configuration Settings) and CM-7 (Least Functionality) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A06:2025 Insecure DesignA08:2025 Software or Data Integrity Failures

EU & UK References

Vulnerability Data

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…

more

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.

CWE(s)
CWE-426CWE-436

Related Threats

MITRE ATT&CK Enterprise Techniques

T1574.009 Path Interception by Unquoted Path Stealth
Adversaries may execute their own malicious payloads by hijacking vulnerable file path references.
attack.mitre.org →
T1034 Path Interception Persistence
**This technique has been deprecated.
attack.mitre.org →
T1574 Hijack Execution Flow Stealth
Adversaries may execute their own malicious payloads by hijacking the way operating systems run programs.
attack.mitre.org →
T1574.001 DLL Stealth
Adversaries may abuse dynamic-link library files (DLLs) in order to achieve persistence, escalate privileges, and evade defenses.
attack.mitre.org →
T1574.007 Path Interception by PATH Environment Variable Stealth
Adversaries may execute their own malicious payloads by hijacking environment variables used to load libraries.
attack.mitre.org →
T1574.008 Path Interception by Search Order Hijacking Stealth
Adversaries may execute their own malicious payloads by hijacking the search order used to load other programs.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-106509Same product: Linuxfoundation Backstage
CVE-2026-32235Same product: Linuxfoundation Backstage
CVE-2024-46976Same product: Linuxfoundation Backstage
CVE-2023-35926Same product: Linuxfoundation Backstage
CVE-2026-25152Same product: Linuxfoundation Backstage
CVE-2026-25153Same product: Linuxfoundation Backstage
CVE-2024-45816Same product: Linuxfoundation Backstage
CVE-2026-29186Same product: Linuxfoundation Backstage Plugin-Techdocs-Node
CVE-2026-32236Same product: Linuxfoundation Backstage
CVE-2024-45815Same product: Linuxfoundation Backstage

Affected Assets

linuxfoundation
backstage plugin-techdocs-node
≤ 1.14.6 · 1.15.0 — 1.15.4
linuxfoundation
backstage
1.51.0 · ≤ 1.50.5 · 1.51.1 — 1.54.6

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

CM-6 Configuration Settings partial match

Secure baseline settings can enforce absolute, organization-controlled paths for critical resources.

CM-7 Least Functionality partial match

Least-functionality configuration can prohibit unapproved directories or executables from being reachable via search paths.

SA-8 Security and Privacy Engineering Principles partial match

Engineering principles such as trusted paths, complete mediation, and least privilege directly require hard-coded or validated search paths instead of external ones.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-01 partial match
blocks

Hardened configuration baselines can enforce safe search paths and restrict environment variables that enable the weakness.

PR.PS-05 partial match
blocks

Preventing execution of unauthorized code directly blocks the malicious binaries that an untrusted search path would load.

PR.PS-06 partial match
blocks

Secure development practices include avoiding or sanitizing externally influenced search paths in application code.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.14 Information transfer partial match
removes
A.5.15 Access control partial match
removes
A.5.16 Identity management partial match
removes
A.5.17 Authentication information partial match
removes
A.5.18 Access rights partial match
removes
A.8.10 Information deletion partial match
removes

Hardening callouts derived

DISA STIG baselines are authored against specific weaknesses. Where this CVE cites a broad weakness class, the mapping is not asserted at that abstraction (owner ruling, 2026-09-25: grade only at Base and below), so no rule is shown here rather than a rule shown against the wrong grain.

  • No fine-grained STIG row for CWE-436, a class-level weakness, and none of its children carries one either.

References