EUVD-2026-60755
GHSA-cjxq-c7rj-x436
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network delivery via malicious webpage; UI:R reflects required victim interaction; S:U consistent with sandboxed renderer model; full C/I/A reflects use-after-free enabling code execution with privilege escalation.
Primary rating from Vendor (mozilla).
CVSS VectorVendor: mozilla
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Privilege escalation due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.
Articles & Coverage 1
AnalysisAI
Use-after-free memory corruption in Firefox's Canvas2D graphics component enables privilege escalation against any unpatched browser version. Remote unauthenticated attackers can achieve full confidentiality, integrity, and availability impact by delivering a malicious web page to a victim using Firefox prior to version 154 (stable) or the affected ESR releases. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to actively visit an attacker-controlled web page using an unpatched Firefox version (stable prior to 154, ESR prior to 140.14 or 153.1). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 High score (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) reflects a network-delivered attack requiring only user interaction - a realistic social engineering threshold for browser exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker registers or compromises a web domain and embeds JavaScript that triggers the Canvas2D use-after-free through carefully crafted rendering operations. A victim running an unpatched Firefox version is directed to this page via a phishing email or malicious advertisement, causing the browser to execute the attacker's payload with escalated privileges within the browser process. … |
| Remediation | Upgrade to Firefox 154 (stable), Firefox ESR 140.14, or Firefox ESR 153.1 immediately, as confirmed by Mozilla advisories mfsa2026-74, mfsa2026-76, and mfsa2026-77. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an organization-wide inventory of Firefox deployments and identify all instances running versions prior to 154 (stable) or vulnerable ESR releases. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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