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.This issue affects Fireware OS: 12.1 through 12.11.8 and 2025.1 through 2026.1.2.
Note, this vulnerability does not affect Firebox platforms that do not support the Access Portal feature, including the T-15 and T-35.
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Affected Vendors & Products
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History
Mon, 30 Mar 2026 14:15:00 +0000
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ssvc
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Mon, 30 Mar 2026 13:00:00 +0000
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| Description | 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.This issue affects Fireware OS: 12.1 through 12.11.8 and 2025.1 through 2026.1.2. Note, this vulnerability does not affect Firebox platforms that do not support the Access Portal feature, including the T-15 and T-35. | |
| Title | WatchGuard Firebox Insecure Deserialization in Fireware Access Portal | |
| First Time appeared |
Watchguard
Watchguard fireware Os |
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| Weaknesses | CWE-502 | |
| CPEs | cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:12.1 cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:2025.1 |
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| Vendors & Products |
Watchguard
Watchguard fireware Os |
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| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: WatchGuard
Published: 2026-03-30T12:38:01.593Z
Updated: 2026-03-30T13:19:55.385Z
Reserved: 2026-03-16T12:50:10.806Z
Link: CVE-2026-4266
Updated: 2026-03-30T13:19:52.252Z
Status : Awaiting Analysis
Published: 2026-03-30T13:16:22.573
Modified: 2026-03-30T13:26:07.647
Link: CVE-2026-4266
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