Cyber Resilience

CVE-2026-12324

Mozilla Firefox ≤ 140.12.0

Published
16 June 2026
Modified
17 June 2026
Patch / advisory
View advisory
CVSS Score v3.1 7.3
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
EPSS Score 0.0021 11th percentile
Risk Priority 54 floored blend · peak EPSS

Summary

CVE-2026-12324 is a high-severity Improper Check or Handling of Exceptional Conditions (CWE-703) vulnerability in Mozilla Firefox. Its CVSS base score is 7.3 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Endpoint Denial of Service (T1499); ranked at the 11th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SC-24 (Fail in Known State) and SI-17 (Fail-safe Procedures) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A10:2025 Mishandling of Exceptional Conditions

EU & UK References

Vulnerability Data

Incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

CWE(s)
CWE-703

Related Threats

MITRE ATT&CK Enterprise Techniques

T1499 Endpoint Denial of Service Impact
Adversaries may perform Endpoint Denial of Service (DoS) attacks to degrade or block the availability of services to users.
attack.mitre.org →
T1499.004 Application or System Exploitation Impact
Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.
attack.mitre.org →
T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-13022Same product: Mozilla Firefox
CVE-2025-13023Same product: Mozilla Firefox
CVE-2025-13026Same product: Mozilla Firefox
CVE-2025-13016Same product: Mozilla Firefox
CVE-2025-13021Same product: Mozilla Firefox
CVE-2026-8091Same product: Mozilla Firefox
CVE-2026-4689Same product: Mozilla Firefox
CVE-2024-7652Same product: Mozilla Firefox
CVE-2026-12329Same product: Mozilla Firefox
CVE-2026-4694Same product: Mozilla Firefox

Affected Assets

mozilla
firefox
≤ 140.12.0 · ≤ 152.0.0
mozilla
thunderbird
≤ 140.12.0 · ≤ 152.0.0

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SC-24 Fail in Known State good match

Enforces failure to a known state while preserving required properties, limiting impact of unhandled exceptions.

SI-17 Fail-safe Procedures good match

Mandates explicit fail-safe procedures triggered by indicated failures, structurally preventing unhandled exceptional conditions.

SA-8 Security and Privacy Engineering Principles partial match

Requires application of security engineering principles that include robust exception and error handling during design.

SI-11 Error Handling partial match

Requires generation of safe, actionable error messages that directly addresses proper handling of exceptional conditions.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices explicitly require anticipating and correctly handling exceptional conditions during design and coding.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.6.8 Information security event reporting none match
none

Reporting of unhandled errors or exceptional conditions surfaces latent failure paths so they can be corrected before exploitation.

References