Is CVE-2026-92045 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-92045 being exploited in the wild.

How severe is CVE-2026-92045?

Critical severity, with a CVSS score of 9.6, published 15 September 2026.

Which products and versions are affected?

Mozilla Firefox before 156; Mozilla Firefox ESR before 153.3; Mozilla Thunderbird before 153.3.

Is there a fix for CVE-2026-92045?

A patch was published on 2026-09-15: Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-92045 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-92045?

Check whether you run Mozilla Firefox, Mozilla Firefox ESR or Mozilla Thunderbird at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-92045: Mozilla Firefox sandbox escape in WebRTC due to incorrect boundary conditions

CVE-2026-92045 · Severity: critical · CVSS 9.6 · Published 2026-09-15

Firefox's WebRTC component contains a flaw that allows attackers to escape the browser's security sandbox through incorrect boundary checking. This could allow malicious web content to break out of the browser's isolation layer and access protected system resources or sensitive user data.

Technologies: Mozilla Firefox, Mozilla Firefox ESR, Mozilla Thunderbird. Vendors: Mozilla.

Quick answers

Is CVE-2026-92045 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-92045 being exploited in the wild.
How severe is CVE-2026-92045?: Critical severity, with a CVSS score of 9.6, published 15 September 2026.
Which products and versions are affected?: Mozilla Firefox before 156; Mozilla Firefox ESR before 153.3; Mozilla Thunderbird before 153.3.
Is there a fix for CVE-2026-92045?: A patch was published on 2026-09-15: Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-92045 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-92045?: Check whether you run Mozilla Firefox, Mozilla Firefox ESR or Mozilla Thunderbird at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A boundary condition vulnerability exists in Firefox's WebRTC component that permits sandbox escape. The vulnerability stems from incorrect validation of memory or data boundaries in the WebRTC implementation, allowing an attacker to bypass the sandbox through memory corruption or out-of-bounds access. The attack requires network access (visiting a malicious website); no user interaction beyond visiting the site is needed. A successful exploit grants an attacker escape from the browser sandbox, potentially enabling arbitrary code execution outside browser restrictions. Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3 contain the fix.

Affected products

Mozilla Firefox before 156
Mozilla Firefox ESR before 153.3
Mozilla Thunderbird before 156
Mozilla Thunderbird before 153.3

Timeline

2026-09-15: disclosed
2026-09-15: patched: Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3

References

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