Is CVE-2026-2783 actively exploited?

CVE-2026-2783 has no public evidence of in-the-wild exploitation as of 2026-02-25.

What is the CVSS score for CVE-2026-2783?

CVE-2026-2783 has a CVSS score of 7.5 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

How do I patch CVE-2026-2783?

Patch guidance is available from mozilla security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-2783.

Fix CVE-2026-2783 - HIGH mozilla firefox

Q: Which products are affected by CVE-2026-2783?

4 products: mozilla firefox, mozilla firefox, mozilla thunderbird, mozilla thunderbird.

Description

Information disclosure due to JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: none
Availability: none
Weaknesses: CWE-843

Metadata

Primary Vendor: MOZILLA
Published: 2/24/2026
Last Modified: 2/25/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-2783

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary