CVE-2026-88064: Backstage is an open framework for building developer portals

This month

HIGH 8.8WATCHLISTUPGRADEUPGRADE

CVE-2026-88064 is a high-severity flaw (CVSS 8.8) 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 from 1.15.0 until 1.15.4, the @backstage/plugin-techdocs-node package insufficiently validates mkdocs.yml supplied by an authenticated user who can register or modify a TechDocs source. Unsafe Python YAML tags, markdown_extensions names and configuration, theme options, and extra_templates values can reach the documentation generator and cause unintended code execu

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.2% (top 33%)
CISA exploited list	No
Weakness	CWE-20, CWE-1336
Published	2026-09-16
Last modified	2026-10-14

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

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-16 15:18 UTCPublished CVE record published
2026-10-14 18:02 UTCUpdated Record last modified

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: < 1.14.6 · >= 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 || rpm -q backstage || backstage --version

2. UPGRADE to 1.14.6 (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.

3. If no update is available yet, DOWNGRADE to a release before 1.15.0 (Debian / Ubuntu)

apt-cache madison backstage sudo apt install backstage=<VERSION_BEFORE_1.15.0> 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_1.15.0> 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-2026-88064?

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

Is CVE-2026-88064 being exploited?

CVE-2026-88064 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-2026-88064 affect?

CVE-2026-88064 affects backstage plugin-techdocs-node, backstage. Severity is high (CVSS 8.8). Backstage is an open framework for building developer portals. Prior to 1.14.6 and from 1.15.0 until 1.15.4, the @backstage/plugin-techdocs-node package insufficiently validates mkdocs.yml supplied by an authenticated user who can register

How urgent is CVE-2026-88064?

Priority 53/100. High severity; On your watchlist

Software pages

Python vulnerabilities

Related CVEs

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References

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