VulnerabilityAnalyzed

CVE-2026-106494

Prior to 0.17.8, the @backstage/backend-defaults package is affected by improper input validation in cloud storage url readers.

MEDIUM 4.9EPSS 0.31%

Does this matter?

Lower severity and a low EPSS score (0.31%). Track it; it rarely justifies an emergency change on its own.

Description

Backstage is an open framework for building developer portals. Prior to 0.17.8, the @backstage/backend-defaults package is affected by improper input validation in cloud storage url readers. An attacker with write access to a cloud storage bucket used by Backstage could craft object names that could collide with protected files in the output directory. In certain deployment configurations, this could lead to content injection. This issue is fixed in version 0.17.8.

CVSS 3.1: 4.9 MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
EPSS: 0.31% probability · 23th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-22, CWE-73
Affected: linuxfoundation/backstage\/backend defaults · linuxfoundation/backstage
Source: security-advisories@github.com

EPSS trend

EPSS moved from 0.3% on 7 October 2026 to 0.3% on 26 October 2026.

References

https://github.com/backstage/backstage/commit/14e925ce5b905dd8daa64c3009722febda76034cPatch
https://github.com/backstage/backstage/releases/tag/v1.54.6Patch, Release Notes
https://github.com/backstage/backstage/security/advisories/GHSA-7649-wm97-w3j3Mitigation, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.