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Vulnerabilities

Vulnerability · CVE-2026-106499

Backstage is an open framework for building developer portals.

Published Oct 6, 2026 · catalog updated Oct 15, 2026 · Backstage is an open

Check if you run it

No confirmed exploitation is on record for CVE-2026-106499. EPSS is 0.27%. Act only if a listed version of Backstage is an open is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Backstage is an open).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium4.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.27%
Remediation
Advisory link
Affected products
cpe linuxfoundation/backstage · cpe linuxfoundation/backstage/plugin-scaffolder-backend

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 to users who can access the resulting task logs. This issue is fixed in version 4.1.0.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe linuxfoundation/backstageversion unspecified
  • cpe linuxfoundation/backstage/plugin-scaffolder-backendversion unspecified

How to fix CVE-2026-106499

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-106499. EPSS is 0.27%. Act only if a listed version of Backstage is an open is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-532: Insertion of Sensitive Information into Log File. EPSS 0.27%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 6, 2026 · NIST NVD

    Detected

    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 dur

  2. Oct 15, 2026 · NIST NVD

    Updated

    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 dur

Sources

  • CVE.orgVulnerability recordCVE-2026-106499

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-106499

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-106499

    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 atta

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.