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No exploitation reportedFix available

CVE-2026-106499

Backstage: Secret-derived values may be exposed in scaffolder task logs

No exploitation reported by the sources we read.

  • Published2026-10-06
  • Fixed in1.54.6
  • WeaknessCWE-532

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-10-0622:17CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-106499?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-106499?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Linuxfoundation backstage
BranchAffectedFixed in
1.54< 1.54.61.54.6
Linuxfoundation backstage\/plugin-scaffolder-backend
BranchAffectedFixed in
4.1< 4.1.04.1.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-106499 Red Hat Product Security4 known affected

    plugin-scaffolder-backend: Backstage: Information disclosure via secret leakage in Scaffolder task logs

    rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend as a component of Red Hat Developer Hub · rhdh/rhdh-hub-rhel9 as a component of Red Hat Developer Hub · ansible-automation-platform/automation-portal as a component of Self-service automation portal 2 · +1 more

Full record on NVD

Fix

  1. Update Linuxfoundation backstage to 1.54.6
  2. Workaround from the vendor Red Hat Product Security CVE-2026-106499 · 4 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
  3. No fix available, says the vendor Red Hat Product Security CVE-2026-106499 · 4 productsFix deferred

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2026-10-07
  • OpenCVESSVC decisionnone—
  • CNACVSS 3.14.9read 2026-10-23
  • CNAweakness (CWE)CWE-532read 2026-10-23
  • FIRST EPSSEPSS score0.3 %2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Published
2026-10-06
Last Modified
2026-10-15
NVD status
Analyzed

Frequently asked questions

What is CVE-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 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.

Is CVE-2026-106499 actively exploited?

Active exploitation of CVE-2026-106499 has not been confirmed. Its EPSS score was 0.3% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-106499?

CVE-2026-106499 has a CVSS v3 base score of 4.9 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.

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