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TI-2026-61488 Aliases CVE-2026-90452GHSA-vfcm-4hjc-64rr

Improper certificate validation in Malcolm

Priority LOW 26CWE-295Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
Spoofing
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-295.

Summary

Requests from the reverse proxy to the identity-provider service for token discovery, introspection, and credential exchange do not verify the identity provider's server certificate. An attacker positioned on the network path between the proxy and the identity provider could impersonate the identity provider and issue forged authentication tokens accepted by the deployment.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00098 0th percentileScored 2026-11-07
Fix Fixed Malcolm (CISA): v26.06.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CISAMalcolmbefore v26.06.0v26.06.0Patch availableCNA
  • Malcolm VendorCISA Affected before v26.06.0 Fixed in v26.06.0 Patch available CNA

Remediation

  • Fix · CNA Malcolm (CISA) Fixed in v26.06.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    CISA Malcolm — raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/O…

    15 records Highest priority Priority MEDIUM 1 MEDIUM, 14 LOW

    Other records, highest priority first

    • TI-2026-61492 Use of default credentials in MalcolmPriority MEDIUM 47
    • TI-2026-61480 OS Command Injection in MalcolmPriority LOW 39
    • TI-2026-61485 Missing Authentication for Critical Function in MalcolmPriority LOW 36
    Show all 15 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-90452
  2. 2026-10-03 Alias added: GHSA-vfcm-4hjc-64rr

References

Advisory 1

Other 1

  • TI-2026-69642 Server-side request forgery in Malcolm file upload component CVSS 3.1HIGH 7.1
  • TI-2026-69640 Cross-Site Request Forgery in Malcolm CVSS 3.1HIGH 7.1
  • TI-2026-69638 Compressed file uploads in Malcolm can exhaust shared disk space CVSS 3.1MEDIUM 6.5
  • TI-2026-69637 Incorrect authorization in Malcolm exposes role-restricted paths CVSS 3.1MEDIUM 5.4
  • TI-2025-24590 CISA Thorium download stream divide by zero CVSS 4.0MEDIUM 5.3
  • TI-2025-24585 CISA Thorium insecure downloaded file path validation CVSS 4.0MEDIUM 5.3
See all 33 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences