CVE-2026-100792

7.1 HIGH 0.3% exploit odds Fix listed Other Browser & mail

What it is

JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.

At a glance

Exploitability: Can be exploited over the network without logging in, but needs a user to act. High risk of data exposure.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-09-29 13:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-19 15:29 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.3% in the next 30 days (EPSS).
Severity: 7.1 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2026-09-29 13:17 UTC
Last modified: 2026-10-19 15:29 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Weakness: CWE-843
Record status: Analyzed

Affected

Mozilla Firefox < 140.17.0
Mozilla Firefox < 153.4.0
Mozilla Firefox < 157.0.0
Mozilla Thunderbird < 140.17.0
Mozilla Thunderbird < 153.4.0
Mozilla Thunderbird < 157.0

Attack profile CVSS 3.1 · 7.1

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required
Scope: Unchanged
Confidentiality: High
Integrity: Low
Availability: None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record