CVE-2026-106504: Backstage is an open framework for building developer portals

Q: How do I fix CVE-2026-106504?

backstage\/plugin-scaffolder-backend: upgrade to 4.1.0; backstage: upgrade to 1.54.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-106504 being exploited?

CVE-2026-106504 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-2026-106504 affect?

CVE-2026-106504 affects backstage\/plugin-scaffolder-backend, backstage. Severity is medium (CVSS 6.5). Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder task logs. An authenticated user who can create and

Q: How urgent is CVE-2026-106504?

Priority 32/100. On your watchlist

Routine

MEDIUM 6.5WATCHLISTUPGRADEUPGRADE

CVE-2026-106504 is a medium-severity flaw (CVSS 6.5) affecting backstage\/plugin-scaffolder-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 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder task logs. An authenticated user who can create and read scaffolder tasks may be able to observe sensitive values in task logs in deployments with restrictive action permissions and affected templates. Exploitation requires a denied action whose input contains s

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	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-532
Published	2026-10-06
Last modified	2026-10-13

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

Last updated 2026-10-13 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-06 22:17 UTCPublished CVE record published
2026-10-13 21:08 UTCUpdated Record last modified

linuxfoundation backstage\/plugin-scaffolder-backend UPGRADE

Affected: < 4.1.0

Fixed in: 4.1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy backstageplugin-scaffolder-backend || rpm -q backstageplugin-scaffolder-backend || backstageplugin-scaffolder-backend --version

2. UPGRADE to 4.1.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade backstageplugin-scaffolder-backend

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade backstageplugin-scaffolder-backend

Note

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

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-2026-106504?

backstage\/plugin-scaffolder-backend: upgrade to 4.1.0; backstage: upgrade to 1.54.6. Exact commands for each OS are on this page.

Is CVE-2026-106504 being exploited?

CVE-2026-106504 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-2026-106504 affect?

CVE-2026-106504 affects backstage\/plugin-scaffolder-backend, backstage. Severity is medium (CVSS 6.5). Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder task logs. An authenticated user who can create and

How urgent is CVE-2026-106504?

Priority 32/100. On your watchlist

Related CVEs

CVE-2026-106461 MEDIUM 4.3 UPGRADE UPGRADE Backstage is an open framework for building developer portals
CVE-2026-106462 MEDIUM 6.4 UPGRADE UPGRADE Backstage is an open framework for building developer portals
CVE-2026-106499 MEDIUM 4.9 UPGRADE UPGRADE Backstage is an open framework for building developer portals
CVE-2026-106500 HIGH 8.5 UPGRADE UPGRADE Backstage is an open framework for building developer portals
CVE-2026-106501 CRITICAL 9.6 UPGRADE UPGRADE Backstage is an open framework for building developer portals

References

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