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01 Record

CVE-2026-106503

Backstage: Scaffolder action input authorization bypass

HighPUBLISHEDCNA: GitHub_M
CNA base score8.1 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
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02 Description

Backstage: Scaffolder action input authorization bypass

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.49% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 42.1% of scored records. A rank, not a probability.
NVD base score
8.1 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD analysis status
Analyzed. NVD last modified this record on 2026-10-13.
Red Hat severity
Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-10-06 21:37Z22 DAYS AGO
Last updated
2026-10-09 01:55Z20 DAYS AGO
Reserved
2026-10-06
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
High (CVSS 8.1)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weaknesses
  • CWE-178Improper Handling of Case SensitivityBase
  • CWE-284Improper Access ControlPillar
  • CWE-807Reliance on Untrusted Inputs in a Security DecisionBase
Data version
5.2
Document digest
91947a0f3d61138738a8e3dc5fc9eeb1c95b01b4c120123cac4887673e253437

05 Affected products

VendorProductVersionsPlatforms
backstagebackstage< 1.49.6, >= 1.50.0-next.0, < 1.50.5, >= 1.51.0-next.0, < 1.54.6—
@backstageplugin-scaffolder-backend< 3.3.1, >= 3.4.0, < 3.4.1, >= 4.0.0, < 4.0.3, >= 4.0.4, < 4.1.0—

06 References