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PatchSiren cyber security CVE debrief

CVE-2026-13054 WatchGuard CVE debrief

A path traversal vulnerability in the WatchGuard Fireware OS Management Web UI allows a privileged authenticated attacker to write arbitrary files on the Firebox's filesystem. This vulnerability affects Fireware OS 11.0 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and including 2026.2. The vulnerability has a high CVSS score of 8.6 and is classified as HIGH severity. Users of affected Fireware OS versions should prioritize patching or mitigating this vulnerability.

Vendor
WatchGuard
Product
Fireware OS
CVSS
HIGH 8.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-03
Original CVE updated
2026-08-28
Advisory published
2026-07-03
Advisory updated
2026-08-28

Who should care

Users of WatchGuard Fireware OS 11.0 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and including 2026.2 should prioritize patching or mitigating this vulnerability. This includes administrators and security teams responsible for managing and securing WatchGuard Firebox devices. The vulnerability has a high CVSS score of 8.6 and is classified as HIGH severity, indicating a significant risk to affected systems.

Technical summary

A path traversal vulnerability in the WatchGuard Fireware OS Management Web UI allows a privileged authenticated attacker to write arbitrary files on the Firebox's filesystem. This vulnerability affects Fireware OS 11.0 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and including 2026.2. The vulnerability is caused by inadequate input validation and sanitization in the Management Web UI, allowing attackers to bypass security restrictions and write files to arbitrary locations on the Firebox's filesystem.

Defensive priority

High

Recommended defensive actions

  • Inventory and verify affected WatchGuard Fireware OS versions
  • Apply vendor patches or updates
  • Monitor for suspicious file writes
  • Restrict access to Management Web UI
  • Implement compensating controls
  • Review and update incident response plans
  • Conduct vulnerability scanning and penetration testing

Evidence notes

Evidence is limited. Official CVE and NVD records confirm the vulnerability. WatchGuard has published an advisory. The vulnerability affects Fireware OS 11.0 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and including 2026.2. Defenders should verify the affected scope and apply patches or updates accordingly.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-13054 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-13054

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

  • CVE-2026-13054 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-13054

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

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00028

    5d1c2695-1a31-4499-88ae-e847036fd7e3

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.