CVE-2026-78616Network attack vector

Administrator browser script execution via crafted certificate

Published Aug 27, 2026 · Updated Aug 27, 2026

Stored XSS in WatchGuard Dimension before 2.3.1 allows remote authenticated users to run JavaScript in another administrator's browser. The Trusted CA configuration stores crafted certificate data and later serves it without neutralizing executable script content. Exploitation requires one administrator to save the certificate and another authenticated administrator to view the affected configuration, confining execution to the victim's browser session.

CVSS severity4.8
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in WatchGuard Dimension before 2.3.1 allows remote authenticated users to run JavaScript in another administrator's browser. The Trusted CA configuration stores crafted certificate data and later serves it without neutralizing executable script content. Exploitation requires one administrator to save the certificate and another authenticated administrator to view the affected configuration, confining execution to the victim's browser session.

The record

CVE
CVE-2026-78616
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
WatchGuard Technologies
Product
WatchGuard Dimension
Classifications
CWE-79
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.0 <2.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

WatchGuard Technologies · WatchGuard Dimensionversion=2.0 <2.3.1

Published CVSS scores

4.8WatchGuardCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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