CVE-2026-106489 · GHSA-rg9r-hr7g-5gc2
Backstage: Improper authorization enforcement for TechDocs static content
- Risk score
- 48/100
- CVSS
- 6.5 v3.1
- Exploit chance (30 days)
- 0.3%
- Published
- 6 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- Backstage is an open framework for building developer portals. Prior to 2.2.4, the @backstage/plugin-techdocs-backend package is affected by improper authorization enforcement for techdocs static content. An authenticated user with access to one TechDocs documentation site could craft a URL able to read documentation …
- Affected
- @backstage/plugin-techdocs-backend (npm) < 2.2.4
- Fix
- Upgrade @backstage/plugin-techdocs-backend to 2.2.4 or later.
- Exploitation
- No known exploitation
Story map
At a glance
@backstage/plugin-techdocs-backend: Yellow, plan it in. 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…
The flaws
- CVE-2026-106489: Backstage: Improper authorization enforcement for TechDocs static content (CVSS 6.5 · EPSS 0%)
- CVE-2026-106490: Backstage: Improper input validation in TechDocs static content requests (CVSS 6.5 · EPSS 0%)
The fix
Upgrade @backstage/plugin-techdocs-backend: 2.2.4 or later on your release line
Who is exposed: @backstage/plugin-techdocs-backend (npm) < 2.2.4
Where it stands
- No known exploitation
Connects to
- Same weakness: Path traversal (CWE-22). 398 other warnings in 30 days
Why it is Yellow
- CVSS 6.5 medium
- On your watchlist: npm
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| @backstage/plugin-techdocs-backend | npm | < 2.2.4 | 2.2.4 |
References
- https://github.com/advisories/GHSA-rg9r-hr7g-5gc2
- https://github.com/backstage/backstage/security/advisories/GHSA-rg9r-hr7g-5gc2
- https://nvd.nist.gov/vuln/detail/CVE-2026-106489
- https://github.com/backstage/backstage/commit/bf6bbf7326ada7d96d7b2c4ebc4a71546106f311
- https://github.com/backstage/backstage/releases/tag/v1.54.6
- https://github.com/advisories/GHSA-rg9r-hr7g-5gc2
Original description
Backstage is an open framework for building developer portals. Prior to 2.2.4, the @backstage/plugin-techdocs-backend package is affected by improper authorization enforcement for techdocs static content. An authenticated user with access to one TechDocs documentation site could craft a URL able to read documentation belonging to a different entity. This only affects deployments using the external TechDocs builder with an external storage provider (S3, GCS, etc.) and the permission framework enabled. Instances that do not use the permission framework are unaffected, since TechDocs content is visible to all authenticated users by design. This issue is fixed in version 2.2.4.
Last activity 6 Oct 2026. Patch Forecast updates every hour.