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Permission policy information leakage in Backstage permission system

Moderate severity GitHub Reviewed Published Apr 16, 2025 in backstage/backstage • Updated Apr 17, 2025

Package

npm @backstage/plugin-permission-backend (npm)

Affected versions

< 0.6.0

Patched versions

0.6.0

Description

Impact

A vulnerability in the Backstage permission plugin backend allows callers to extract some information about the conditional decisions returned by the permission policy installed in the permission backend. If the permission system is not in use or if the installed permission policy does not use conditional decisions, there is no impact.

Patches

This issue has been resolved in version 0.6.0 of the permissions backend.

Workarounds

Administrators of the permission policies can ensure that they are crafted in such a way that conditional decisions do not contain any sensitive information.

References

If you have any questions or comments about this advisory:

Open an issue in the Backstage repository
Visit our Discord, linked to in Backstage README

References

@Rugvip Rugvip published to backstage/backstage Apr 16, 2025
Published to the GitHub Advisory Database Apr 16, 2025
Reviewed Apr 16, 2025
Published by the National Vulnerability Database Apr 16, 2025
Last updated Apr 17, 2025

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(5th percentile)

Weaknesses

CVE ID

CVE-2025-32791

GHSA ID

GHSA-f8j4-p5cr-p777

Source code

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