CVE Explorer
CVE-2026-4266
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.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"Fireware OS","vendor":"WatchGuard","versions":[{"lessThanOrEqual":"12.11.8","status":"affected","version":"12.1","versionType":"semver"},{"lessThanOrEqual":"2026.1.2","status":"affected","version":"2025.1","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:8baebd578b1c4733b89cb04085a0f3f9ab14c02ab5207a087b842ffb01573710 · sha256:f01c6036edb23380… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":8.4,"baseSeverity":"HIGH","privilegesRequired":"HIGH","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"…
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:8baebd578b1c4733b89cb04085a0f3f9ab14c02ab5207a087b842ffb01573710 · sha256:f01c6036edb23380… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-502","description":"CWE-502 Deserialization of Untrusted Data","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:8baebd578b1c4733b89cb04085a0f3f9ab14c02ab5207a087b842ffb01573710 · sha256:f01c6036edb23380… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"tags":["vendor-advisory"],"url":"https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00007"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:8baebd578b1c4733b89cb04085a0f3f9ab14c02ab5207a087b842ffb01573710 · sha256:f01c6036edb23380… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.