MEDIUM
CVE-2026-6774
Published: April 21, 2026· Updated: Apr 22, 2026
5.4
CVSS v3.1
Official Description
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
Technical Analysis
CVE-2026-6774 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionRequired
ScopeChanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
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
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (3)
→
https://bugzilla.mozilla.org/show_bug.cgi?id=2016915Permissions Required
→
https://www.mozilla.org/security/advisories/mfsa2026-30/Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2026-33/Vendor Advisory
Quick Facts
CVE IDCVE-2026-6774
CVSS Score5.4 / 10
SeverityMEDIUM
CISA KEVNo
Affected1 vendor
PublishedApr 21, 2026
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-6774 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.