Free and open · new CVEs checked every 20 minutesStatusRSSOpen dataContact

CVE-2026-106509: Backstage is an open framework for building developer portals

48
This month
HIGH 7.7WATCHLISTUPGRADEUPGRADE

CVE-2026-106509 is a high-severity flaw (CVSS 7.7) affecting backstage plugin-techdocs-node, 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 1.14.6, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs theme configuration in techdocs. When TechDocs is configured to build documentation locally or in a container, a user with write access to a registered repository can include configuration values in mkdocs.yml that cause arbitrary code execution during the documentation build proc

Why this priority

  • High severity
  • Public exploit reference
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score7.7 (High)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededLow
User interactionNone
EPSS exploit chance0.5% (top 56%)
CISA exploited listNo
WeaknessCWE-94, CWE-1336
Published2026-10-06
Last modified2026-10-09
Publisher (CNA): GitHub, Inc. · Vendor: linuxfoundation

Share: LinkedIn · X · Reddit

Last updated 2026-10-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

linuxfoundation backstage plugin-techdocs-node UPGRADE
Affected: < 1.14.6 · >= 1.15.0 and < 1.15.4
Fixed in: 1.14.6, 1.15.4
Safe to downgrade to: a release before 1.15.0
1. Check installed version
apt-cache policy backstage-plugin-techdocs-node || rpm -q backstage-plugin-techdocs-node || backstage-plugin-techdocs-node --version
2. UPGRADE to 1.14.6 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade backstage-plugin-techdocs-node
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade backstage-plugin-techdocs-node
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 1.15.0 (Debian / Ubuntu)
apt-cache madison backstage-plugin-techdocs-node sudo apt install backstage-plugin-techdocs-node=<VERSION_BEFORE_1.15.0> sudo apt-mark hold backstage-plugin-techdocs-node
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list backstage-plugin-techdocs-node sudo dnf downgrade backstage-plugin-techdocs-node-<VERSION_BEFORE_1.15.0> sudo dnf versionlock add backstage-plugin-techdocs-node
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
linuxfoundation backstage UPGRADE
Affected: < 1.50.5 · >= 1.51.1 and < 1.54.6 · 1.51.0 · 1.51.0 next0 · 1.51.0 next1 · 1.51.0 next2 · 1.51.0 next3
Fixed in: 1.50.5, 1.54.6
Safe to downgrade to: a release before 1.51.0
1. Check installed version
apt-cache policy backstage || rpm -q backstage || backstage --version
2. UPGRADE to 1.50.5 (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.
3. If no update is available yet, DOWNGRADE to a release before 1.51.0 (Debian / Ubuntu)
apt-cache madison backstage sudo apt install backstage=<VERSION_BEFORE_1.51.0> sudo apt-mark hold backstage
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list backstage sudo dnf downgrade backstage-<VERSION_BEFORE_1.51.0> sudo dnf versionlock add backstage
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
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-2026-106509?

backstage plugin-techdocs-node: upgrade to 1.14.6, 1.15.4; backstage: upgrade to 1.50.5, 1.54.6. Exact commands for each OS are on this page.

Is CVE-2026-106509 being exploited?

CVE-2026-106509 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-2026-106509 affect?

CVE-2026-106509 affects backstage plugin-techdocs-node, backstage. Severity is high (CVSS 7.7). Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs theme configuration in techdocs. When TechDocs is configured to build d

How urgent is CVE-2026-106509?

Priority 48/100. High severity; Public exploit reference; On your watchlist

Related CVEs

References

← Back to latest CVEs

Get the weekly exploited-CVE digest by emailThe CVEs being attacked this week and how to fix them. No spam, unsubscribe any time.