CVE-2026-3987
HIGHCVSS 7.2/10EPSS 0.64%
Last modified
CVE-2026-3987 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems may allow a privileged authenticated remote attacker to execute arbitrary code in the context of an elevated system process.. EPSS estimates a 0.64% chance of exploitation in the next 30 days.
Description
A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems may allow a privileged authenticated remote attacker to execute arbitrary code in the context of an elevated system process.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Watchguard | Fireware | >= 2025.1, < 2026.2 |
| Watchguard | Fireware | >= 12.6.1, < 12.12 |
References
- https://psirt.watchguard.com/CVE-2026-3987Broken Link
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-3987?
A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems may allow a privileged authenticated remote attacker to execute arbitrary code in the context of an elevated system process.
How severe is CVE-2026-3987?
CVE-2026-3987 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 0.64% probability of exploitation in the next 30 days.
How do I fix CVE-2026-3987?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2026-3987?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST