Is CVE-2026-2784 actively exploited?

No active exploitation of CVE-2026-2784 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-2784 be exploited remotely?

Yes. CVE-2026-2784 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-2784?

CVE-2026-2784 has a CVSS score of 9.8 (CRITICAL) and an EPSS exploitation probability of 0.04%.

HOME VULNERABILITIESCVE-2026-2784

CRITICAL

CVE-2026-2784

Published: February 24, 2026· Updated: Feb 28, 2026

9.8

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:13.8th

Official Description

Mitigation bypass in the DOM: Security component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

NVD Source

Technical Analysis

CVE-2026-2784 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Affected Vendors & Products

Mozilla2 products

firefoxthunderbird

Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Exploit-DB

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

PacketStorm

Security advisories & exploits

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2026-13/

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2026-15/

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2026-16/

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2026-17/

News & Research Mentioning CVE-2026-2784

SenseLive X3050

CISA Alerts· Apr 21, 2026

View CSAF Summary Successful exploitation of these vulnerabilities could allow an attacker to take complete control of the device. The following versions of SenseLive X3050 are affected: X3050 V1.523 (CVE-2026-40630, CVE-2026-25720, CVE-2026-35503, CVE-2026-39462, CVE-2026-27843, CVE-2026-40431, CVE-2026-40623, CVE-2026-27841, CVE-2026-40620, CVE-2026-35064, CVE-2026-25775) CVSS Vendor Equipment Vulnerabilities v3 9.8 SenseLive SenseLive X3050 Authentication Bypass Using an Alternate Path or Channel, Insufficient Session Expiration, Use of Hard-coded Credentials, Insufficiently Protected Credentials, Missing Authentication for Critical Function, Cleartext Transmission of Sensitive Information, Missing Authorization, Cross-Site Request Forgery (CSRF) [xlite_meta score:69 src:CISA Alerts xlite_fp:091c7263d6831034718315c48ed92f9afe84b11ea8aa81d250798497c7b64b43]