CVE-2026-118008
HIGH
CVSS 8.8
PoC Available
Published: 2026-10-27
Modified: 2026-10-28
Enriched via mock
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AI Threat Summary
CVE-2026-118008 is a high-severity vulnerability with a CVSS score of 8.8 affecting the target software. Threat hunters should monitor for exploit attempts and apply vendor patches immediately.
Description
Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 159 and Thunderbird 159.
Attack Chain
1
Initial Access
Attacker has low-privilege local access (e.g., via phishing or compromised service account)
2
Privilege Escalation
Attacker exploits CVE-2026-118008 to escalate from low-privilege user to root/SYSTEM/admin
3
Defense Evasion
Elevated privileges used to disable security controls, clear logs, and establish persistence
4
Impact
Full system compromise achieved; attacker can install ransomware, exfiltrate all data, or pivot
MITRE ATT&CK Techniques
Indicators of Compromise
| Type | Value | Description | |
|---|---|---|---|
| user_agent | Mozilla/5.0 (compatible; exploit/1.0) |
Generic exploit scanner user agent pattern | |
| url | /api/vuln-endpoint?payload=<malicious> |
Exploit attempt against application endpoint — monitor access logs for anomalous params |
Remediation
1. Apply vendor-supplied security patches immediately.
2. If patches are unavailable, apply recommended mitigations from the vendor advisory.
3. Enable WAF rules or IDS signatures to detect exploitation attempts.
4. Monitor logs for indicators of compromise listed above.
5. Implement network segmentation to limit blast radius if exploitation occurs.
6. Subscribe to vendor security advisories for this product.
Quick Facts
| CVE ID | CVE-2026-118008 |
| CVSS Score | 8.8 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| Published | 2026-10-27 |
| Exploited | No |
| CISA KEV | No |
| PoC | Available |