EUVD-2026-89494
GHSA-r9g3-r4fp-gh46
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable management API with low-privilege credentials required (PR:L, AC:L); limited daemon-scoped file read (C:L) and full process crash (A:H), no integrity impact.
Primary rating from Vendor (WatchGuard).
CVSS VectorVendor: WatchGuard
Lifecycle Timeline
4DescriptionCVE.org
A missing authorization vulnerability in the wgagent management daemon's session initialization function allows an authenticated, low-privileged user (including a read-only or guest administrator account) to crash the wgagent process and read arbitrary files accessible to the daemon by submitting a specially crafted management API request.
AnalysisAI
Authenticated low-privileged users - including read-only or guest administrator accounts - can crash the wgagent management daemon and read arbitrary files accessible to that daemon on WatchGuard Fireware OS by sending a specially crafted request to the management API's session initialization function, which is missing an authorization check. The attack is network-reachable and requires no user interaction, but it is gated behind a valid management-plane session at low privilege (PR:L), so exposure depends on how many such accounts exist and whether the management interface is reachable by the attacker. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a valid authenticated session on the Fireware OS management interface at low privilege - explicitly including read-only or guest administrator accounts (PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but access-gated priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor patch status is not confirmed by the available data, so the authoritative action is to consult the WatchGuard PSIRT advisory at https://psirt.watchguard.com/CVE-2026-90441 and apply the fixed Fireware OS release the vendor designates for the affected track; do not attempt to substitute an inferred version number. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, restrict network access to the WatchGuard Fireware OS management interface (including the management API and wgagent daemon) to trusted administrative networks only, disable or remove any unnecessary guest, read-only, or low-privileged administrator accounts, and enable logging and alerting for wgagent crashes or unexpected file reads. …
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External POC / Exploit Code
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