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CVE-2026-106505: Backstage is an open framework for building developer portals

38
Routine
HIGH 7.7WATCHLISTUPGRADEUPGRADE

CVE-2026-106505 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 and 1.15.4, the @backstage/plugin-techdocs-node package is affected by bypass of mkdocs configuration sanitizer in techdocs backend. Users with the ability to commit changes to a repository that uses TechDocs can circumvent the MkDocs configuration file sanitizer introduced in response to CVE-2026-25153 and execute arbitrary code on the TechDocs backend host during doc

Why this priority

  • High severity
  • 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 chance0.3% (top 76%)
CISA exploited listNo
WeaknessCWE-426, CWE-436
Published2026-10-06
Last modified2026-10-09
Publisher (CNA): GitHub, Inc. · Vendor: linuxfoundation

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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-2026-106505?

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-2026-106505 being exploited?

CVE-2026-106505 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-2026-106505 affect?

CVE-2026-106505 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 and 1.15.4, the @backstage/plugin-techdocs-node package is affected by bypass of mkdocs configuration sanitizer in techdocs backend. Users with the ability to co

How urgent is CVE-2026-106505?

Priority 38/100. High severity; On your watchlist

Related CVEs

References

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