PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-13375 WatchGuard CVE debrief

CVE-2026-13375 is a Stored XSS vulnerability in WatchGuard Fireware OS, specifically in the Autotask Technology Integration module. The vulnerability is caused by improper neutralization of input during web page generation, allowing Stored XSS attacks. This CVE is an additional unmitigated attack path for CVE-2025-13938. Users of WatchGuard Fireware OS 12.4 up to and including 12.12, 12.5 up to and including 12.5.18, and 2025.1 up to and including 2026.2 should apply patches or mitigations. The vulnerability has a CVSS score of 4.8 and a severity of MEDIUM.

Vendor
WatchGuard
Product
Fireware OS
CVSS
MEDIUM 4.8
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 12.4 up to and including 12.12, 12.5 up to and including 12.5.18, and 2025.1 up to and including 2026.2 should apply patches or mitigations. This includes operators, administrators, and security teams responsible for managing and securing WatchGuard Fireware OS deployments.

Technical summary

The vulnerability is caused by improper neutralization of input during web page generation in WatchGuard Fireware OS (Autotask Technology Integration module). This allows Stored XSS attacks. The affected versions are Fireware OS 12.4 up to and including 12.12, 12.5 up to and including 12.5.18, and 2025.1 up to and including 2026.2. The CVE record was published on 2026-07-03T00:16:51.373Z and has not been modified since then.

Defensive priority

Medium

Recommended defensive actions

  • Apply patches or mitigations provided by WatchGuard
  • Review and update Fireware OS to a non-vulnerable version
  • Implement compensating controls such as web application firewalls
  • Monitor for suspicious activity and exception tracking
  • Review relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-03T00:16:51.373Z and was last modified on 2026-07-07T18:16:34.907Z. The NVD entry is currently Undergoing Analysis. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the vendor. The CVE is an additional unmitigated attack path for CVE-2025-13938.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-13375 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-13375

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

  • CVE-2026-13375 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-13375

    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-2026-00017

    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.