CVE-2026-106500 Backstage @backstage/plugin-scaffolder-backend - Broken Access Control

Backstage @backstage/plugin-scaffolder-backend < 3.3.1, < 3.4.1, < 4.0.3, < 4.1.0 contains a broken access control caused by improper task state validation in scaffolder backend, letting authenticated users with scaffolder task permissions modify backend files, exploit requires specific timing and writable backend files.

CVSS base score 8.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.34% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Data Tampering, Denial Of Service, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
6 October 2026
Updated
15 October 2026
Weakness
CWE-59

Vendor fix

Upgrade to versions 3.3.1, 3.4.1, 4.0.3, or 4.1.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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