Is CVE-2026-8953 actively exploited?

No active exploitation of CVE-2026-8953 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-8953 be exploited remotely?

Yes. CVE-2026-8953 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-8953?

CVE-2026-8953 has a CVSS score of 9.6 (CRITICAL).

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CRITICAL

CVE-2026-8953

Published: May 19, 2026· Updated: May 19, 2026

9.6

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:13.0th

Official Description

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

NVD Source

Risk Analysis

This critical vulnerability allows an attacker to escape the sandbox environment in Mozilla Firefox and Thunderbird due to a use-after-free flaw in the Disability Access APIs. With a CVSS score of 9.6, this flaw presents a significant risk, as successful exploitation could lead to full system compromise. The EPSS score is currently unavailable, so the likelihood of exploitation is unknown.

No public exploit is currently known for this vulnerability. Its network attack vector and low attack complexity suggest it is remotely exploitable, requiring user interaction.

Recommended Action

To mitigate this vulnerability, users should upgrade to Firefox 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, or Thunderbird 140.11. Applying these updates promptly is crucial for maintaining security.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-8953 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.6.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.