CVE-2026-106499: Backstage is an open framework for building developer portals

Q: How do I fix CVE-2026-106499?

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-2026-106499 being exploited?

CVE-2026-106499 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-2026-106499 affect?

CVE-2026-106499 affects backstage\/plugin-scaffolder-backend, backstage. Severity is medium (CVSS 4.9). Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package could expose secret-derived values in Scaffolder task logs. Deployments that configure sensitive scaffolder.defa

Q: How urgent is CVE-2026-106499?

Priority 27/100. On your watchlist

Routine

MEDIUM 4.9WATCHLISTUPGRADEUPGRADE

CVE-2026-106499 is a medium-severity flaw (CVSS 4.9) 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 could expose secret-derived values in Scaffolder task logs. Deployments that configure sensitive scaffolder.defaultEnvironment.secrets and allow an attacker to create or modify Scaffolder templates are affected. A template author could cause secret-derived values used during template iteration to be persisted and exposed

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	4.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-532
Published	2026-10-06
Last modified	2026-10-15

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

Last updated 2026-10-15 · 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
2026-10-15 02:16 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-2026-106499?

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-2026-106499 being exploited?

CVE-2026-106499 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-2026-106499 affect?

CVE-2026-106499 affects backstage\/plugin-scaffolder-backend, backstage. Severity is medium (CVSS 4.9). Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package could expose secret-derived values in Scaffolder task logs. Deployments that configure sensitive scaffolder.defa

How urgent is CVE-2026-106499?

Priority 27/100. 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-2026-106504 MEDIUM 6.5 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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