CVE-2026-13377 (GCVE-0-2026-13377)

Vulnerability from cvelistv5 – Published: 2026-07-02 23:05 – Updated: 2026-07-02 23:05
VLAI
Title
WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in SIP Proxy Configuration
Summary
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS SIP Proxy module allows Stored XSS. This vulnerability is an additional unmitigated attack path for CVE-2025-6947. This issue affects Fireware OS 12.0 up to and including 12.12, 12.5 up to and including 12.5.18, and 2025.1 up to and including 2026.2.
Severity
4.8 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
Assigner
References
Impacted products
Vendor Product Version
WatchGuard Fireware OS Affected: 12.0 , ≤ 12.12 (semver)
Affected: 12.5 , ≤ 12.5.18 (semver)
Affected: 2025.1 , ≤ 2026.2 (semver)
Create a notification for this product.
Credits
Simone Paganessi (https://www.linkedin.com/in/simonepaganessi)
Show details on NVD website
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        "orgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3",
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        "defect": [
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        "discovery": "EXTERNAL"
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    "dateReserved": "2026-06-25T20:34:54.862Z",
    "dateUpdated": "2026-07-02T23:05:32.445Z",
    "state": "PUBLISHED"
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.