CVE-2026-29185
Backstage vulnerable to potential reading of SCM URLs using built in token
Description
### 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/
How to fix CVE-2026-29185
To remediate CVE-2026-29185, upgrade the affected package to a fixed version below.
- —upgrade to 1.20.1 or later
Is CVE-2026-29185 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 1.20.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW2.7 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N |