CVE-2026-2783
Information disclosure due to JIT miscompilation in the JavaScript Engine: JIT component
Severity Score
7.5
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
Track
*SSVC
Descriptions
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.
Information disclosure due to JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
*Credits:
x0e
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:Track
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2026-02-19 CVE Reserved
- 2026-02-24 CVE Published
- 2026-04-13 CVE Updated
- 2026-05-03 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
- CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')
CAPEC
References (4)
| URL | Tag | Source |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://www.mozilla.org/security/advisories/mfsa2026-13 | 2026-02-25 | |
| https://www.mozilla.org/security/advisories/mfsa2026-15 | 2026-02-25 | |
| https://www.mozilla.org/security/advisories/mfsa2026-16 | 2026-02-25 | |
| https://www.mozilla.org/security/advisories/mfsa2026-17 | 2026-02-25 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Mozilla Search vendor "Mozilla" | Firefox Search vendor "Mozilla" for product "Firefox" | < 140.8.0 Search vendor "Mozilla" for product "Firefox" and version " < 140.8.0" | esr |
Affected
| ||||||
| Mozilla Search vendor "Mozilla" | Firefox Search vendor "Mozilla" for product "Firefox" | < 148.0 Search vendor "Mozilla" for product "Firefox" and version " < 148.0" | - |
Affected
| ||||||
| Mozilla Search vendor "Mozilla" | Thunderbird Search vendor "Mozilla" for product "Thunderbird" | < 140.8.0 Search vendor "Mozilla" for product "Thunderbird" and version " < 140.8.0" | esr |
Affected
| ||||||
| Mozilla Search vendor "Mozilla" | Thunderbird Search vendor "Mozilla" for product "Thunderbird" | < 148.0 Search vendor "Mozilla" for product "Thunderbird" and version " < 148.0" | - |
Affected
| ||||||