CVE-2026-29185: @backstage/integration Backstage Vulnerable To Potential Reading Vulnerability

LOW
Advisory Identifier: GHSA-95v5-prp4-5gv5
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CVSS 2.7
CWE-22
Published
Advisory Summary

CVE-2026-29185 is a LOW (CVSS 2.7) backstage vulnerable to potential reading vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting @backstage/integration libraries in the npm ecosystem. The issue involves backstage vulnerable to potential reading of scm urls using built in token. Remediation is available by upgrading affected packages to version 1.20.1.

CVE-2026-29185 at a Glance

CVE Identifier CVE-2026-29185
GHSA Identifier GHSA-95v5-prp4-5gv5
Severity LOW
CVSS v3.1 Base Score 2.7
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product @backstage/integration
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 2.7

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-29185

To remediate this vulnerability, upgrade all affected @backstage/integration dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

@backstage/integration fixed: 1.20.1 
npm install @backstage/integration@1.20.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls @backstage/integration

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-29185, inspect your project dependencies using npm:

npm ls @backstage/integration

Analyze the terminal output to locate any version of @backstage/integration in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.20.1), your application is affected.

Note: The npm ls @backstage/integration command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In @backstage/integration, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact A vulnerability in the SCM URL parsing used by Backstage integrations allowed path traversal sequences in encoded form to be included in file paths. When these URLs were processed by integration functions that construct API URLs, the traversal segments could redirect requests to unintended SCM provider API endpoints using the configured server-side integration credentials. This affects instances that use any of the SCM integrations (GitHub, Bitbucket Server, Bitbucket Cloud) with the scaffolder or other features that accept user-provided SCM URLs. ### Patches This is patched in `@backstage/integration` version 1.20.1. ### Workarounds There is no workaround for this vulnerability. Users should upgrade to the patched version. ### References - Backstage SCM integration documentation: https://backstage.io/docs/integrations/

CVE-2026-29185 Affected @backstage/integration Versions

1 component(s)
Fixed Versions:
1.20.1
Product / Package Ecosystem Affected Versions Fixed Version
@backstage/integration
npm/@backstage/integration
npm
< 1.20.1
1.20.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/backstage/backstage/security/advisories/GHSA-95v5-prp4-5gv5
NVD — CVE-2026-29185 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-29185
@backstage/integration Source Repository REPOSITORY
https://github.com/backstage/backstage

Frequently Asked Questions

What is CVE-2026-29185?
CVE-2026-29185 is a security vulnerability in @backstage/integration involving Backstage vulnerable to potential reading of SCM URLs using built in token under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which @backstage/integration versions are affected?
Affected versions include releases prior to 1.20.1 across affected packages: @backstage/integration.
What version fixes CVE-2026-29185?
Upgrading to 1.20.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is @backstage/integration affected?
Yes, @backstage/integration is affected in releases prior to 1.20.1. Upgrade your dependency to 1.20.1 or later.
What is the CVSS score of CVE-2026-29185?
CVE-2026-29185 has a CVSS v3.1 base score of 2.7 (LOW) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-29185?
CVE-2026-29185 is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.).
How can I check npm dependencies for CVE-2026-29185?
Run the dependency tree command: 'npm ls @backstage/integration'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-95v5-prp4-5gv5",
  "modified" : "2026-03-09T15:46:52Z",
  "published" : "2026-03-05T00:20:45Z",
  "aliases" : [ "CVE-2026-29185" ],
  "summary" : "Backstage vulnerable to potential reading of SCM URLs using built in token",
  "details" : "### Impact\n\nA vulnerability in the SCM URL parsing used by Backstage integrations allowed path traversal sequences in encoded form to be included in file paths. When these URLs were processed by integration functions that construct API URLs, the traversal segments could redirect requests to unintended SCM provider API endpoints using the configured server-side integration credentials.\n\nThis affects instances that use any of the SCM integrations (GitHub, Bitbucket Server, Bitbucket Cloud) with the scaffolder or other features that accept user-provided SCM URLs.\n\n###  Patches\n\nThis is patched in `@backstage/integration` version 1.20.1.\n\n### Workarounds\n\nThere is no workaround for this vulnerability. Users should upgrade to the patched version.\n\n###  References \n\n  - Backstage SCM integration documentation: https://backstage.io/docs/integrations/",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@backstage/integration"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.20.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.20.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/backstage/backstage/security/advisories/GHSA-95v5-prp4-5gv5"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-29185"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/backstage/backstage"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-05T00:20:45Z",
    "nvd_published_at" : "2026-03-07T15:15:55Z"
  }
}