CVE-2026-106501 Backstage @backstage/plugin-scaffolder-backend - Information Disclosure

Backstage @backstage/plugin-scaffolder-backend < 3.3.1, < 3.4.1, < 4.0.3, < 4.1.0 contains a sensitive information exposure caused by unauthorized access to another user's Scaffolder task data, letting authenticated users disclose internal execution data including credentials, exploit requires user authentication.

CVSS base score 9.6 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.48% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Information Disclosure
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Published
6 October 2026
Updated
15 October 2026
Weakness
CWE-200

Vendor fix

Update 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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