Skip to main content
No exploitation reportedFix available

CVE-2026-106506

Backstage: Improper input validation in scaffolder task list ordering

No exploitation reported by the sources we read.

  • Published2026-10-06
  • Fixed in1.54.6
  • WeaknessCWE-202 · CWE-203

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 is affected by improper input validation in scaffolder task list ordering. An authenticated Backstage user with permission to create and read relevant scaffolder tasks may be able to infer confidential task data under specific conditions. Successful exploitation requires retained task secrets, visibility of a target task, knowledge of the secret structure, and repeated requests. 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-2026-106506?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-106506?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-2026-106506 Red Hat Product Security4 known affected

    plugin-scaffolder-backend: plugin-scaffolder-backend: Information disclosure via improper task list ordering

    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-2026-106506 · 4 productsTo mitigate this configure your reverse proxy or gateway to reject task-list requests with custom ordering, or strictly limit them to safe fields like created_at, status, and created_by. Enforce strict role-based access controls to restrict scaffolder task creation and read permissions exclusively …
  3. No fix available, says the vendor Red Hat Product Security CVE-2026-106506 · 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 3.15.3read 2026-10-23
  • CNAweakness (CWE)CWE-202, CWE-203read 2026-10-23
  • FIRST EPSSEPSS score0.2 %2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Published
2026-10-06
Last Modified
2026-10-09
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-106506?

Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by improper input validation in scaffolder task list ordering. An authenticated Backstage user with permission to create and read relevant scaffolder tasks may be able to infer confidential task data under specific conditions. Successful exploitation requires retained task secrets, visibility of a target task, knowledge of the secret structure, and repeated requests. This issue is fixed in version 4.1.0.

Is CVE-2026-106506 actively exploited?

Active exploitation of CVE-2026-106506 has not been confirmed. Its EPSS score was 0.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-106506?

CVE-2026-106506 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.

Running @backstage/plugin-scaffolder-bac? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, October 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database