CVE-2026-106486CWE-22CWE-59path-traversal

CVE-2026-106486

High · published October 7, 2026

CVSS v3.1
8.5
EPSS
0%
Percentile
24.3
In the wild
Unconfirmed
What it is

Backstage is an open framework for building developer portals. Prior to 0.3.10 in @backstage/plugin-scaffolder-backend-module-bitbucket-cloud and 0.2.25 in @backstage/plugin-scaffolder-backend-module-bitbucket-server, the Bitbucket pull-request Scaffolder actions did not sufficiently validate filesystem paths. An authenticated user who can execute an eligible template and influence an allowed Bitbucket repository could affect paths outside the expected working area, potentially compromising backend confidentiality, integrity, or availability. This issue is fixed in @backstage/plugin-scaffolder-backend-module-bitbucket-cloud 0.3.10 and @backstage/plugin-scaffolder-backend-module-bitbucket-server 0.2.25.

The record
Technical detail
CVSS v3.1
8.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00325 · 24.3th percentile
Weaknesses
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'); CWE-59 · Improper Link Resolution Before File Access ('Link Following')
Published
2026-10-07T01:17Z
Affected products (3)
ProductVersionsFixed in
linuxfoundation/backstage\/plugin-scaffolder-backend-module-bitbucket-cloud< 0.3.100.3.10
linuxfoundation/backstage\/plugin-scaffolder-backend-module-bitbucket-server< 0.2.250.2.25
linuxfoundation/backstage< 1.54.61.54.6
References (3)
https://github.com/backstage/backstage/commit/818528e112c36167d76187e9e63fb518399c4dd2 · [email protected]https://github.com/backstage/backstage/releases/tag/v1.54.6 · [email protected]https://github.com/backstage/backstage/security/advisories/GHSA-g8rx-f7m5-7794 · [email protected]
EPSS history
Timeline
  • 08 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 06 OCT 20:35Z
    Backstage: Improper filesystem validation in Bitbucket pull-request scaffolder actions
    cvelistv5