Remote Code Execution Vulnerability in Mozilla Firefox
CVE-2026-15718

4.3MEDIUM

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
14 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-15718?

A security flaw in Mozilla Firefox allows for potential remote code execution exploits. Although the exploit code for this vulnerability is publicly available, there have been no confirmed instances of its exploitation in the wild. Users are advised to upgrade to Firefox version 152.0.6 or later to mitigate the risks associated with this vulnerability.

Affected Version(s)

Thunderbird 140.13

Firefox 140.13

Firefox 152.0.6

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-15718-who-put-ptrs-in-my-wasm
Created by SneakyNachos

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2045443
https://www.mozilla.org/security/advisories/mfsa2026-67/
https://www.mozilla.org/security/advisories/mfsa2026-70/

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Christian Holler
.