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PatchSiren cyber security CVE debrief

CVE-2026-66477 Shufflehound CVE debrief

CVE-2026-66477 is a MEDIUM severity vulnerability with a CVSS score of 5.3, affecting Gillion versions up to 4.13. It is characterized as Unauthenticated Broken Access Control. This vulnerability allows attackers to bypass access controls, potentially leading to unauthorized data access or modifications. Users of Gillion versions up to 4.13 should assess and mitigate this vulnerability promptly. The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N, indicating a medium severity level due to the potential for data integrity impact.

Vendor
Shufflehound
Product
Gillion
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-27
Original CVE updated
2026-07-27
Advisory published
2026-07-27
Advisory updated
2026-07-27

Who should care

Users of Gillion versions up to 4.13 should assess and mitigate this Unauthenticated Broken Access Control vulnerability. This includes administrators and security teams responsible for Gillion deployments. They should review the official CVE record and NVD details to understand the vulnerability's scope and impact. Implementing compensating controls such as Web Application Firewalls (WAFs) may be necessary while patches are being applied. Monitoring for suspicious activity related to access control is also recommended.

Technical summary

CVE-2026-66477 is a vulnerability in Gillion versions up to 4.13, allowing unauthenticated broken access control. The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N. It is associated with CWE-862. This vulnerability has a CVSS score of 5.3 and is considered MEDIUM severity. The vulnerability could allow attackers to perform unauthorized actions, potentially leading to data integrity impacts. Users should assess their Gillion installations and apply necessary patches or updates.

Defensive priority

Medium priority due to the unauthenticated nature and potential for data integrity impact. Implementing compensating controls and monitoring for suspicious activity are recommended while patches are being applied.

Recommended defensive actions

  • Inventory and assess Gillion installations for version 4.13 or earlier.
  • Apply vendor patches or updates if available.
  • Implement compensating controls such as Web Application Firewalls (WAFs) to mitigate access control issues.
  • Monitor for suspicious activity related to access control.
  • Consider upgrading to a version of Gillion beyond 4.13 if possible.

Evidence notes

Evidence from Patchstack and NVD indicates a vulnerability in Gillion versions up to 4.13. Official records show a CVSS score of 5.3 and a MEDIUM severity level. The CVE record was published on 2026-07-27T15:17:12.223Z and has not been modified since then. The vulnerability is associated with CWE-862. Defensive measures should be verified against official advisories and CVE details.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-66477 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-66477

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-66477 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-66477

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.