Note, this vulnerability does not affect Firebox platforms that do not support the Access Portal feature, including the T15 and T35.
Analysis and contextual insights are available on OpenCVE Cloud.
Vendor Solution
Fireware OS 2026.2, Fireware OS 12.12
Tracking
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No advisories yet.
Fri, 14 Aug 2026 13:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Watchguard firebox Cloud
Watchguard firebox M270 Watchguard firebox M290 Watchguard firebox M295 Watchguard firebox M370 Watchguard firebox M390 Watchguard firebox M395 Watchguard firebox M440 Watchguard firebox M4600 Watchguard firebox M470 Watchguard firebox M4800 Watchguard firebox M495 Watchguard firebox M5600 Watchguard firebox M570 Watchguard firebox M5800 Watchguard firebox M590 Watchguard firebox M595 Watchguard firebox M670 Watchguard firebox M690 Watchguard firebox M695 Watchguard firebox Nv5 Watchguard firebox T115-w Watchguard firebox T125 Watchguard firebox T125-w Watchguard firebox T145 Watchguard firebox T145-w Watchguard firebox T185 Watchguard firebox T20 Watchguard firebox T25 Watchguard firebox T40 Watchguard firebox T45 Watchguard firebox T55 Watchguard firebox T70 Watchguard firebox T80 Watchguard firebox T85 Watchguard fireboxv Watchguard fireware |
|
| CPEs | cpe:2.3:a:watchguard:firebox_cloud:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m270:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m290:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m295:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m370:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m390:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m395:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m440:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m4600:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m470:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m4800:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m495:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m5600:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m570:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m5800:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m590:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m595:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m670:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m690:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_m695:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_nv5:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_t115-w:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_t125-w:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_t125:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_t145-w:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_t145:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_t185:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_t20:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_t25:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_t40:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_t45:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_t55:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_t70:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_t80:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:firebox_t85:-:*:*:*:*:*:*:* cpe:2.3:h:watchguard:fireboxv:-:*:*:*:*:*:*:* cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:* |
|
| Vendors & Products |
Watchguard firebox Cloud
Watchguard firebox M270 Watchguard firebox M290 Watchguard firebox M295 Watchguard firebox M370 Watchguard firebox M390 Watchguard firebox M395 Watchguard firebox M440 Watchguard firebox M4600 Watchguard firebox M470 Watchguard firebox M4800 Watchguard firebox M495 Watchguard firebox M5600 Watchguard firebox M570 Watchguard firebox M5800 Watchguard firebox M590 Watchguard firebox M595 Watchguard firebox M670 Watchguard firebox M690 Watchguard firebox M695 Watchguard firebox Nv5 Watchguard firebox T115-w Watchguard firebox T125 Watchguard firebox T125-w Watchguard firebox T145 Watchguard firebox T145-w Watchguard firebox T185 Watchguard firebox T20 Watchguard firebox T25 Watchguard firebox T40 Watchguard firebox T45 Watchguard firebox T55 Watchguard firebox T70 Watchguard firebox T80 Watchguard firebox T85 Watchguard fireboxv Watchguard fireware |
|
| Metrics |
cvssV3_1
|
Mon, 10 Aug 2026 17:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | 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. |
| CPEs | cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:2025.1 |
cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:* |
| References |
|
Mon, 30 Mar 2026 14:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Mon, 30 Mar 2026 13:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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 |
|
| Weaknesses | CWE-502 | |
| CPEs | cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:12.1 cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:2025.1 |
|
| Vendors & Products |
Watchguard
Watchguard fireware Os |
|
| References |
| |
| Metrics |
cvssV4_0
|
Subscriptions
Status: PUBLISHED
Assigner: WatchGuard
Published:
Updated: 2026-08-10T16:39:49.547Z
Reserved: 2026-03-16T12:50:10.806Z
Link: CVE-2026-4266
Updated: 2026-03-30T13:19:52.252Z
Status : Analyzed
Published: 2026-03-30T13:16:22.573
Modified: 2026-08-14T13:38:15.240
Link: CVE-2026-4266
No data.
OpenCVE Enrichment
Updated: 2026-08-11T00:00:08Z