CVE-2026-106490: Backstage is an open framework for building developer portals

Q: How do I fix CVE-2026-106490?

backstage\/plugin-techdocs-backend: upgrade to 2.2.4; backstage: upgrade to 1.54.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-106490 being exploited?

CVE-2026-106490 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-106490 affect?

CVE-2026-106490 affects backstage\/plugin-techdocs-backend, backstage. Severity is medium (CVSS 6.5). 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 pr

Q: How urgent is CVE-2026-106490?

Priority 35/100. On your watchlist

Routine

MEDIUM 6.5WATCHLISTUPGRADEUPGRADE

CVE-2026-106490 is a medium-severity flaw (CVSS 6.5) affecting backstage\/plugin-techdocs-backend, backstage. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 polic

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-22, CWE-23
Published	2026-10-06
Last modified	2026-10-22

Publisher (CNA): GitHub, Inc. · Vendor: linuxfoundation

Last updated 2026-10-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-06 21:17 UTCPublished CVE record published
2026-10-22 14:40 UTCUpdated Record last modified

linuxfoundation backstage\/plugin-techdocs-backend UPGRADE

Affected: < 2.2.4

Fixed in: 2.2.4

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls backstageplugin-techdocs-backend

2. UPGRADE to 2.2.4

npm install backstageplugin-techdocs-backend@">=2.2.4"

linuxfoundation backstage UPGRADE

Affected: < 1.54.6

Fixed in: 1.54.6

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy backstage || rpm -q backstage || backstage --version

2. UPGRADE to 1.54.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade backstage

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade backstage

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-106490?

backstage\/plugin-techdocs-backend: upgrade to 2.2.4; backstage: upgrade to 1.54.6. Exact commands for each OS are on this page.

Is CVE-2026-106490 being exploited?

CVE-2026-106490 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-106490 affect?

CVE-2026-106490 affects backstage\/plugin-techdocs-backend, backstage. Severity is medium (CVSS 6.5). 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 pr

How urgent is CVE-2026-106490?

Priority 35/100. On your watchlist

Software pages

Azure vulnerabilities

Related CVEs

CVE-2026-106489 MEDIUM 6.5 UPGRADE UPGRADE Backstage is an open framework for building developer portals

References

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