DOM Content Process Privilege Escalation in Firefox

Privilege escalation in the DOM: Content Processes component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Casky was already ahead

This CVE exploits attack patterns that Casky's 224matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

CVE-2026-16372 is a critical privilege escalation vulnerability (CVSS 9.8) affecting the Document Object Model (DOM) Content Processes component in Firefox and Thunderbird. This vulnerability allows attackers to escape the sandbox protections that isolate web content processes from the host system, potentially gaining elevated privileges on affected systems. The threat is particularly severe because Firefox is widely deployed across consumer and enterprise environments, and DOM-level attacks are difficult to detect at the network perimeter, making this a direct path to system compromise for any user visiting a malicious webpage.

Casky.ai's 224 matched skills map directly to MITRE ATT&CK technique TA0004 (Privilege Escalation) and its sub-techniques, enabling practitioners to detect exploitation patterns through Claude AI's extended reasoning capabilities. When analyzing endpoint telemetry, practitioners would identify suspicious sequences: abnormal process spawning from browser sandboxes, unexpected capability grants to content processes, or unusual memory access patterns indicative of sandbox escape attempts. The platform's skill correlation reveals that attackers chain this DOM vulnerability with process injection and token impersonation techniques—practitioners monitoring for these patterns would see Firefox or Thunderbird content processes attempting system calls typically reserved for unsandboxed applications, suspicious inter-process communication that violates expected sandbox boundaries, or rapid capability escalation following DOM object manipulation. By mapping these behavioral indicators to the underlying CWE-269 (Improper Access Control) root cause, Casky helps teams distinguish legitimate browser behavior from exploitation attempts in real time.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

224 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-16372.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

penetration testing · medium

Run

MITRE ATT&CK Techniques

TA0004

Investigate the attack patterns behind CVE-2026-16372

Casky has 224 skills that investigate the attack patterns behind CVE-2026-16372. Run one and get CVSS-scored findings in 3 minutes.

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