CVE-2026-106493: Backstage: Cloud storage catalog locations may cross configured storage boundaries

Description

Backstage is an open framework for building developer portals. Prior to 1.54.6, cloud storage catalog providers did not sufficiently validate object paths. A principal able to create or rename objects in a configured Azure Blob Storage or AWS S3 catalog source could cause catalog descriptors to be read from outside the intended storage boundary, limited to locations reachable with the backend's configured credentials. This issue is fixed in 1.54.6.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N

Attack vector

Network

Complexity

Low

Privileges

High

User interaction

None

Confidentiality

Low

Integrity

None

Availability

None

Scope

Changed

Exploitation

Is it being used?

Exploit prediction (EPSS)0.3% · higher than 20% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

BA

backstage · backstage

< 1.54.6 · source: vendor, NVD

PL

plugin-catalog-backend-module-aws · @backstage

< 0.4.27 · source: vendor

PL

plugin-catalog-backend-module-azure · @backstage

< 0.17.8; < 0.3.21 · source: vendor

BA

Backstage/backend-defaults · Linuxfoundation

before 0.17.8 · source: NVD

BA

Backstage/plugin-catalog-backend-module-aws · Linuxfoundation

before 0.4.27 · source: NVD

BA

Backstage/plugin-catalog-backend-module-azure · Linuxfoundation

before 0.3.21 · source: NVD