HOMEVULNERABILITIESCVE-2026-6760
CRITICAL

CVE-2026-6760

Published: April 21, 2026· Updated: Apr 22, 2026

9.8
CVSS v3.1

Official Description

Mitigation bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

NVD Source

Risk Analysis

This critical vulnerability in Mozilla Firefox and Thunderbird is a mitigation bypass within the Networking: Cookies component. With a CVSS score of 9.8, this flaw could allow an attacker to bypass security measures, potentially leading to severe impacts on confidentiality, integrity, and availability. The lack of an EPSS score means the exploitation likelihood is currently unknown.

No public exploit is known for this vulnerability. The network attack vector and low attack complexity suggest it could be remotely exploitable without user interaction.

Recommended Action

Users should update Firefox to version 150 and Thunderbird to version 150 to apply the necessary security fixes.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-6760 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
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

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2026-30/
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2026-33/

All References (3)

→
https://bugzilla.mozilla.org/show_bug.cgi?id=2016923Permissions 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-2026-6760
CVSS Score9.8 / 10
SeverityCRITICAL
CISA KEVNo
Affected1 vendor
PublishedApr 21, 2026

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-6760 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.
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