CVE-2026-106490

mediumpriority · track · 0EPSS 0.004 · 31 %ileUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.37% (31st) EPSS

CVSS 6.5 · medium

Is it mine?

3 products

Check your exposure

Who says so?

2 sources

nvd · osv

EPSS · scored 2026-10-27

Backstage is an open framework for building developer portals. Prior to 2.2.4, the @backstage/plugin-techdocs-backend package is affected by improper input validation in techdocs static content requests. When using the Azure Blob Storage provider, an authenticated Backstage user may be able to read restricted TechDocs content when entity-level permissions are enabled. Deployments that intentionally disable the default backend authentication policy may have broader exposure. This issue is fixed in version 2.2.4.

cvss

Technical severity, 0–10. One row per scoring source.

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nsecondary · security-advisories@github.comexploitability 2.8 · impact 3.6

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nsecondary · OSV

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-22USCWE-22USCWE-23USCWE-23US

affected products (3)

Products and version ranges known to be affected.

linuxfoundation backstage< 1.54.6nvdUScpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*
linuxfoundation backstage/plugin-techdocs-backend< 2.2.4nvdUScpe:2.3:a:linuxfoundation:backstage\/plugin-techdocs-backend:*:*:*:*:*:*:*:*
npm @backstage/plugin-techdocs-backend< 2.2.4osvUSpkg:npm/%40backstage/plugin-techdocs-backend

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-7mfx-xg57-53c9Backstage: Improper input validation in TechDocs static content requests2026-10-07ghsa · osvUS
### Impact When using the Azure Blob Storage provider, an authenticated Backstage user may be able to read restricted TechDocs content when entity-level permissions are enabled. Deployments that intentionally disable the default backend authentication policy may have broader exposure. ### Patches Patched in `@backstage/plugin-techdocs-backend` version `2.2.4` ### Workarounds - Restrict access to the TechDocs backend to users who are permitted to view all stored documentation until an upgrade can be applied. - Keep the default backend authentication policy enabled.

sources

Which sources assert this record, and when.

nvd osv NVD CVE.org MITRE

published 2026-10-06modified 2026-10-22

references (3) nvd

External citations — patches, advisories, analysis.

https://github.com/backstage/backstage/commit/40ecc4c2e88b0218125b0a3405d1f6315b321974Patch
https://github.com/backstage/backstage/releases/tag/v1.54.6PatchRelease Notes
https://github.com/backstage/backstage/security/advisories/GHSA-7mfx-xg57-53c9MitigationVendor Advisory

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