Path Traversal in Backstage
CVE-2026-29185
Backstage is an open framework for building developer portals. Prior to version 1.20.1, 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 issue has been patched in version 1.20.1.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 2.7 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (29.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000
Affected products
- Backstage — versions < 1.20.1
- Linuxfoundation Backstage\/integration
Weakness classification (CWE)
References
- github.com/backstage/backstage/security/advisories/GHSA-95v5-prp4-5gv5 (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-29185?
- CVE-2026-29185 is a low-severity vulnerability in Backstage, classified under Path Traversal. CVSS score: 2.7/10. Published 2026-03-07.
- How severe is CVE-2026-29185?
- Low severity. CVSS v3 base score is 2.7 out of 10.