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CVE-2026-4266Disclosure(watchguard / firebox_cloud)

LOWCVSS 6.7 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD 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. Note, this vulnerability does not affect Firebox platforms that do not support the Access Portal feature, including the T15 and T35.

watchguard CVEsBack to dashboard
0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-502

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • firebox_cloud
  • firebox_m270
  • firebox_m290
  • firebox_m295

Threat summary

  • 3 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 2 signals
  • Disclosure: 3 classified signals
  • Peaked 1d ago at 2 mentions (2026-03-30); latest day: 1
  • 3 total mentions across 2 days

Affected systems

Vendors
watchguard
Products
firebox_cloudfirebox_m270firebox_m290firebox_m295firebox_m370firebox_m390firebox_m395firebox_m440firebox_m4600firebox_m470

1 version affected across 37 products

Deep dive

Activity timeline3 mentions / 2d
01122Mentions · 2026-03-30: 2Mentions · 2026-04-06: 1Technical Details · 2026-03-30: 203-3004-06
Signal classification1 categories
Disclosure
3100.0%
Referenced assets3 URLs
Classification over time
DateTotalLabels
2026-03-302
Disclosure2
2026-04-061
Disclosure1
Full discourse3 posts
  • CVE@CVEnew
    Disclosure

    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 vulnerabil… https://www.cve.org/CVERecord?id=CVE-2026-4266

    Post summary

    The entry provides a basic disclosure of CVE-2026-4266, describing it as an insecure deserialization flaw that requires local filesystem write access, without any mention of PoC, exploit tools, active attacks, or mitigations.

    0001078
    56.8K followersView on X
  • CERT-PY@CERTpy
    Disclosure

    ⚠️ Vulnerabilidades en productos WatchGuard ❗ CVE-2026-4315 ❗ CVE-2026-4266 ➡️ Más info: https://www.cert.gov.py/vulnerabilidades-en-productos-watchguard-2/ https://t.co/QxvhVpRfkx

    Post summary

    The post announces two WatchGuard CVEs (2026‑4315 and 2026‑4266) and links to external resources for further details.

    00000131
    6.6K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    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 i... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-4266

    Post summary

    The post discloses an insecure deserialization vulnerability in WatchGuard Fireware OS (CVE‑2026‑4266) that permits arbitrary code execution once write access is achieved, but does not provide PoC, exploit tools, patches, or evidence of active exploitation.

    0000059
    4.0K followersView on X
CPE platform detail37 entries

37 of 37 entries

PartVendorProductVersionTarget SWTarget HW
Appwatchguardfirebox_cloud---
HWwatchguardfirebox_m270---
HWwatchguardfirebox_m290---
HWwatchguardfirebox_m295---
HWwatchguardfirebox_m370---
HWwatchguardfirebox_m390---
HWwatchguardfirebox_m395---
HWwatchguardfirebox_m440---
HWwatchguardfirebox_m4600---
HWwatchguardfirebox_m470---
HWwatchguardfirebox_m4800---
HWwatchguardfirebox_m495---
HWwatchguardfirebox_m5600---
HWwatchguardfirebox_m570---
HWwatchguardfirebox_m5800---
HWwatchguardfirebox_m590---
HWwatchguardfirebox_m595---
HWwatchguardfirebox_m670---
HWwatchguardfirebox_m690---
HWwatchguardfirebox_m695---
HWwatchguardfirebox_nv5---
HWwatchguardfirebox_t115-w---
HWwatchguardfirebox_t125---
HWwatchguardfirebox_t125-w---
HWwatchguardfirebox_t145---
HWwatchguardfirebox_t145-w---
HWwatchguardfirebox_t185---
HWwatchguardfirebox_t20---
HWwatchguardfirebox_t25---
HWwatchguardfirebox_t40---
HWwatchguardfirebox_t45---
HWwatchguardfirebox_t55---
HWwatchguardfirebox_t70---
HWwatchguardfirebox_t80---
HWwatchguardfirebox_t85---
HWwatchguardfireboxv---
OSwatchguardfireware---

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