CVE-2026-106457: Backstage is an open framework for building developer portals

Routine

MEDIUM 6.8WATCHLISTUPGRADEUPGRADE

CVE-2026-106457 is a medium-severity flaw (CVSS 6.8) affecting backstage\/plugin-auth-backend-module-cloudflare-access-provider, 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. From 0.1.0 until 0.5.0, the @backstage/plugin-auth-backend-module-cloudflare-access-provider package is affected by insufficient audience validation in the cloudflare access auth provider. The Cloudflare Access auth provider verifies a token's signature and team issuer, but affected versions do not verify that the token was issued for the Backstage application. A user holding a valid

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-287
Published	2026-10-06
Last modified	2026-10-27

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

Last updated 2026-10-27 · 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
2026-10-27 20:48 UTCUpdated Record last modified

linuxfoundation backstage\/plugin-auth-backend-module-cloudflare-access-provider UPGRADE

Affected: >= 0.1.0 and < 0.5.0

Fixed in: 0.5.0

Safe to downgrade to: a release before 0.1.0

1. Check installed version

npm ls backstageplugin-auth-backend-module-cloudflare-access-provider

2. UPGRADE to 0.5.0

npm install backstageplugin-auth-backend-module-cloudflare-access-provider@">=0.5.0"

3. If no update is available yet, DOWNGRADE to a release before 0.1.0

npm view backstageplugin-auth-backend-module-cloudflare-access-provider versions npm install backstageplugin-auth-backend-module-cloudflare-access-provider@"<0.1.0"

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: >= 1.26.0 and < 1.55.0

Fixed in: 1.55.0

Safe to downgrade to: a release before 1.26.0

1. Check installed version

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

2. UPGRADE to 1.55.0 (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 1.26.0 (Debian / Ubuntu)

apt-cache madison backstage sudo apt install backstage=<VERSION_BEFORE_1.26.0> 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_1.26.0> 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-2026-106457?

backstage\/plugin-auth-backend-module-cloudflare-access-provider: upgrade to 0.5.0; backstage: upgrade to 1.55.0. Exact commands for each OS are on this page.

Is CVE-2026-106457 being exploited?

CVE-2026-106457 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-2026-106457 affect?

CVE-2026-106457 affects backstage\/plugin-auth-backend-module-cloudflare-access-provider, backstage. Severity is medium (CVSS 6.8). Backstage is an open framework for building developer portals. From 0.1.0 until 0.5.0, the @backstage/plugin-auth-backend-module-cloudflare-access-provider package is affected by insufficient audience validation in the cloudflare access aut

How urgent is CVE-2026-106457?

Priority 34/100. On your watchlist

Software pages

Cloudflare vulnerabilities

References

← Back to latest CVEs