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CVE-2026-2783

25
FAUCET Score

CVE-2026-2783 is an information disclosure vulnerability in the JavaScript Engine JIT component of Mozilla Firefox and Thunderbird, affecting versions prior to 148 and 140.8 respectively. It stems from JIT miscompilation, potentially leading to sensitive data exposure. Rated High severity with a CVSS score of 7.5, this vulnerability has a low attack complexity and requires no user interaction, making it easily exploitable over a network. While there is no known active exploitation, public exploit code, or KEV listing, the vulnerability has garnered some community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 140.8.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
< 148.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
< 140.8.0CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
< 148.0CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.29%
Probability of exploitation in next 30 days
EPSS Percentile
20.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0029 is in the 4th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (12)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: firefox-0:140.8.0-2.el10_1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: firefox-0:140.8.0-2.el8_10
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: firefox-0:140.8.0-2.el9_7
View patch
mozillavendor investigatingvia nvd_reference
View patch
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: thunderbird
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: firefox
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: thunderbird
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: thunderbird
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: rhel10/thunderbird-flatpak
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: firefox
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: rhel10/firefox-flatpak
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: firefox

Vendor Advisories (1)

redhatCVE-2026-2783Moderate

firefox: Information disclosure due to JIT miscompilation in the JavaScript Engine: JIT component

Feb 24, 2026

References

bugzilla.mozilla.org / show_bug.cgi
Permissions Required
mozilla.org / security/advisories/mfsa2026-13
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-15
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-16
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-17
Vendor Advisory