CVE-2026-4266
CVE-2026-4266: 1 tracked advisory record across WatchGuard. Compare vendor sources and published fix guidance.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
WatchGuard
1 advisory- Advisory severityHigh8.4
High [CVE-2026-4266] WatchGuard Firebox Insecure Deserialization in Fireware Access Portal
CVE-2026-4266Source published Source updated
An Insecure Deserialization vulnerability in WatchGuard Fireware OS allows an attacker that has obtained write access to the local filesystem through another vulnerability to execute arbitrary code in the context of the portald user. Note, this vulnerability does not affect Firebox platforms that do not support the Access Portal feature, including the T15 and T35.
- Affected products in this advisory
- Fireware OS
- Source-reported affected versions
- Fireware OS 2025.1 before 2026.2
- Fireware OS 12.1 before 12.12
- Fireware OS 12.1 before 12.11.9
- Source-reported fixed versions
- 2026.2
- 12.12
- 12.11.9
- Mitigation guidance
- No mitigation guidance extracted; consult the source.
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