CVE-2021-41151

Path Traversal in @backstage/plugin-scaffolder-backend

MEDIUM
4.9
CVSS Score
Published: October 18, 2021 at 08:30 PM UTC
Updated: June 17, 2026 at 04:07 AM UTC
2 products affected across 2 vendorsBackstageBackstage

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Severity
MEDIUM4.9
Exploit prediction
EPSS 1%

Description

Backstage is an open platform for building developer portals. In affected versions A malicious actor could read sensitive files from the environment where Scaffolder Tasks are run. The attack is executed by crafting a custom Scaffolder template with a `github:publish:pull-request` action and a particular source path. When the template is executed the sensitive files would be included in the published pull request. This vulnerability is mitigated by the fact that an attacker would need access to create and register templates in the Backstage catalog, and that the attack is very visible given that the exfiltration happens via a pull request. The vulnerability is patched in the `0.15.9` release of `@backstage/plugin-scaffolder-backend`.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

0.9.4 ≤ v < 0.15.9
Affected range stops below 0.15.9, so it looks safe — our inference, not a vendor statement
v < 0.15.9
Affected range stops below 0.15.9, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusUNDERGOING ANALYSIS
CWE
CWE-22

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