CVE-2026-29185Network attack vector

SCM data disclosure via encoded path traversal

Published Mar 7, 2026 · Updated Mar 7, 2026

Path traversal in Backstage before 1.20.1 allows remote authenticated users to read SCM data through unintended provider API requests. SCM URL parsing preserves encoded traversal segments in file paths, and integration functions append those paths while constructing credentialed API URLs. Affected instances must use GitHub or Bitbucket integrations with the scaffolder or another feature that accepts user-provided SCM URLs; exposure is limited to data reachable with the configured server-side token.

CVSS severity2.7
Low
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Path traversal in Backstage before 1.20.1 allows remote authenticated users to read SCM data through unintended provider API requests. SCM URL parsing preserves encoded traversal segments in file paths, and integration functions append those paths while constructing credentialed API URLs. Affected instances must use GitHub or Bitbucket integrations with the scaffolder or another feature that accepts user-provided SCM URLs; exposure is limited to data reachable with the configured server-side token.

The record

CVE
CVE-2026-29185
Published
Mar 7, 2026
Updated
Mar 7, 2026
Vendor
Spotify
Product
Backstage
Classifications
CWE-22, T1213.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.20.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Spotify · Backstageversion=< 1.20.1

Published CVSS scores

2.7GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1213.003Code Repositories

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo