# Mozilla vulnerabilities & exploitation

**CISA KEV** · **Ransomware**

> As of 2026-10-05, Threadlinqs tracks 7 Mozilla CVEs, 1 in the CISA Known Exploited Vulnerabilities catalog, 1 used in ransomware campaigns, linked to 52 tracked threat campaigns and 6 named threat actors.

**Data as of:** 2026-10-05

## Exploitation timeline

Threadlinqs has recorded 7 Mozilla CVEs published between 2024-10-15 and 2026-09-15. The busiest month was 2026-07 (3 new CVEs). 1 of them (14%) are listed in CISA KEV, which means exploitation in the wild has been confirmed.

## Most exploited vulnerabilities

Ranked with CISA KEV listings first, then EPSS exploit probability, then CVSS score. Showing 7 of 7 tracked Mozilla CVEs.

- [CVE-2024-9680](https://intel.threadlinqs.com/cve/CVE-2024-9680) — CRITICAL 9.8 · KEV · Ransomware · EPSS 30.8% · 2024-10-09
- [CVE-2026-10702](https://intel.threadlinqs.com/cve/CVE-2026-10702) — MEDIUM 4.3 · EPSS 0.6% · 2026-06-02
- [CVE-2026-16405](https://intel.threadlinqs.com/cve/CVE-2026-16405) — HIGH 7.5 · EPSS 0.3% · 2026-07-21
- [CVE-2026-15718](https://intel.threadlinqs.com/cve/CVE-2026-15718) — MEDIUM 4.3 · EPSS 0.2% · 2026-07-14
- [CVE-2026-84637](https://intel.threadlinqs.com/cve/CVE-2026-84637) — CRITICAL 9.8 · EPSS 0.2% · 2026-09-01
- [CVE-2026-84642](https://intel.threadlinqs.com/cve/CVE-2026-84642) — HIGH 7.5 · EPSS 0.1% · 2026-09-01
- [CVE-2026-15719](https://intel.threadlinqs.com/cve/CVE-2026-15719) — MEDIUM 5.4 · EPSS 0.1% · 2026-07-14

## Products affected

Threadlinqs normalises CPE and CNA product records across all 7 CVEs; 2 distinct Mozilla products are affected. The most frequently affected:

- Firefox — 5 CVEs
- Thunderbird — 4 CVEs

## Threat activity

52 tracked threat campaigns reference Mozilla products or exploit Mozilla CVEs; the 25 most recent are listed.

- [ClickFix Campaign Uses Fake CAPTCHA Lures and Browser-Cache Staging to Execute Malicious Commands on Windows (Trojan:Win32/ClickFix, TermFix)](https://intel.threadlinqs.com/threat/TL-2026-2858) — HIGH — 2026-10-03
- [Spectre-v2 Branch Target Reuse (BTR) Attack Leaks Linux Kernel Memory Despite Existing Defenses (CVE-2026-64507, CVE-2026-64508)](https://intel.threadlinqs.com/threat/TL-2026-2796) — HIGH — 2026-09-29
- [ClosedQuorum: Go-Based Windows Implant Delegates Post-Compromise Decisions to a Four-Model LLM Voting Panel](https://intel.threadlinqs.com/threat/TL-2026-2621) — MEDIUM — 2026-09-22
- [Dark Caracal Deploys New GoCaracal Malware with Ethereum-Based C2 Resilience in Venezuela Breach](https://intel.threadlinqs.com/threat/TL-2026-2219) — HIGH — 2026-08-29
- [TrickBot injectDLL Module: Man-in-the-Browser Web Injection Against Certificate Transparency](https://intel.threadlinqs.com/threat/TL-2026-2133) — HIGH — 2026-08-24
- [Known Techniques, Unknown Speed: Aqua Security on How Frontier AI Collapses the Container Attack Chain](https://intel.threadlinqs.com/threat/TL-2026-2113) — HIGH — 2026-08-22
- [Jewelbug APT Runs Espionage and Crypto Fraud Operations Side by Side](https://intel.threadlinqs.com/threat/TL-2026-2002) — HIGH — 2026-08-13
- [Over 250 Fake Download Domains Deliver AMOS and MacSync Infostealers via ClickFix with Server-Side Browser Fingerprinting Evasion Gate](https://intel.threadlinqs.com/threat/TL-2026-1907) — HIGH — 2026-08-06
- [ClickFix Attack Delivers Go-Based macOS Infostealer Targeting Cryptocurrency Wallets and Credentials](https://intel.threadlinqs.com/threat/TL-2026-1920) — HIGH — 2026-08-06
- [Over 250 ClickFix Domains Use Browser Fingerprinting to Hide macOS Malware Lures — Atomic Stealer (AMOS) and MacSync Campaign](https://intel.threadlinqs.com/threat/TL-2026-1899) — HIGH — 2026-08-05
- [CaptiveCrunch Campaign — Storm-2945 Delivers ChocoShell/CornFlake Malware via Compromised Hotel Captive Portal Wi-Fi](https://intel.threadlinqs.com/threat/TL-2026-1857) — HIGH — 2026-08-04
- [Mozilla Firefox / Thunderbird Information Disclosure Vulnerability in Networking: WebSockets (CVE-2026-16405)](https://intel.threadlinqs.com/threat/TL-2026-1878) — HIGH — 2026-08-04
- [Fake Roblox Xeno Script Launcher Pushes Multi-Stage Java-Based Infostealer and RAT Malware (Powercat Campaign)](https://intel.threadlinqs.com/threat/TL-2026-1846) — HIGH — 2026-08-03
- [DOUBLECUP ClickFix Loader-as-a-Service Hides Malware in Browser Cache Images via Steganography](https://intel.threadlinqs.com/threat/TL-2026-1847) — HIGH — 2026-08-03
- [CaptiveCrunch: Storm-2945 (Midnight Blizzard sub-cluster) Hijacks Hotel Wi-Fi Captive Portals to Deliver CornFlake RAT and Steal Microsoft 365 Tokens](https://intel.threadlinqs.com/threat/TL-2026-1808) — HIGH — 2026-07-31
- [MedusaHVNC: Malware-as-a-Service RAT Uses Hidden Desktop (hVNC) to Hijack Live Browser Sessions and Steal Credentials](https://intel.threadlinqs.com/threat/TL-2026-1723) — HIGH — 2026-07-27
- [MedusaHVNC — Hidden Virtual Desktop RAT with AMSI/ETW Bypass and Multi-Browser Session Hijacking](https://intel.threadlinqs.com/threat/TL-2026-1733) — HIGH — 2026-07-27
- [SnappyClient RAT — C++ C2 Implant Delivered via HijackLoader (Operation Turb00 Part 3)](https://intel.threadlinqs.com/threat/TL-2026-1589) — HIGH — 2026-07-21
- [TELEPUZ: Modular MaaS Banking WebInjector Distributed via ClickFix/VIDAR Chain](https://intel.threadlinqs.com/threat/TL-2026-1557) — HIGH — 2026-07-20
- [IonStack: One-Click Firefox JIT-to-Linux-Kernel Root Exploit Chain (CVE-2026-10702 + CVE-2026-43499 "GhostLock") Demonstrated Against Android 17](https://intel.threadlinqs.com/threat/TL-2026-1477) — HIGH — 2026-07-18
- [ClickLock Stealer: ClickFix-Delivered macOS Infostealer with GSocket Reverse-Shell Backdoor](https://intel.threadlinqs.com/threat/TL-2026-1402) — HIGH — 2026-07-16
- [Multi-Vendor Critical Patch Roundup: Firefox 152.0.6, Chrome 150, Adobe ColdFusion/Commerce/AEM (APSB26-68/73/74), and VMware Avi Load Balancer (VMSA-2026-0005)](https://intel.threadlinqs.com/threat/TL-2026-1403) — CRITICAL — 2026-07-16
- [TELEPUZ Malware-as-a-Service Spreads via ClickFix Attacks and Go-Variant Vidar Stealer Chain](https://intel.threadlinqs.com/threat/TL-2026-1420) — HIGH — 2026-07-16
- [macOS Info-Stealer Chains Fake Password Prompt, Telegram Session Theft, and Crypto Wallet App Replacement](https://intel.threadlinqs.com/threat/TL-2026-1494) — HIGH — 2026-07-16
- [CrashStealer: Native C++ macOS Infostealer Impersonating Apple's CrashReporter, Delivered via Notarized "Werkbit" Meeting-App Lure](https://intel.threadlinqs.com/threat/TL-2026-1270) — HIGH — 2026-07-13

## Threat actors targeting Mozilla

Named threat actors attributed to campaigns that involve Mozilla products or CVEs, with the number of linked campaigns:

- [Storm-2945](https://intel.threadlinqs.com/actor/Storm-2945) — 2 campaigns
- [Armored Likho](https://intel.threadlinqs.com/actor/Armored%20Likho) — 1 campaign
- [ClickLock Dev](https://intel.threadlinqs.com/actor/ClickLock%20Dev) — 1 campaign
- [Dark Caracal](https://intel.threadlinqs.com/actor/Dark%20Caracal) — 1 campaign
- [Periwinkle Tempest](https://intel.threadlinqs.com/actor/Periwinkle%20Tempest) — 1 campaign
- [UNC5142](https://intel.threadlinqs.com/actor/UNC5142) — 1 campaign

## How to prioritise Mozilla patching

This order follows the data Threadlinqs holds for Mozilla, not a generic severity checklist:

- 1 of 7 Mozilla CVEs (14%) are in CISA KEV: treat them as actively exploited and remediate them first, starting with [CVE-2024-9680](https://intel.threadlinqs.com/cve/CVE-2024-9680).
- 1 CVE is known to be used in ransomware campaigns; patch these ahead of other KEV entries on internet-facing systems.
- Outside KEV, the highest EPSS scores are [CVE-2026-10702](https://intel.threadlinqs.com/cve/CVE-2026-10702) (0.6%), [CVE-2026-16405](https://intel.threadlinqs.com/cve/CVE-2026-16405) (0.3%), [CVE-2026-15718](https://intel.threadlinqs.com/cve/CVE-2026-15718) (0.2%).
- 2 CVEs score Critical and 2 High on CVSS v3 (maximum 9.8, average 6.9); sequence these after KEV and high-EPSS items.

## About this data

Vendor attribution comes from the CNA and CPE product records of each CVE, folded to one vendor name; CVSS, EPSS and KEV status are read from the Threadlinqs CVE catalog; campaign and actor links come from tracked threat records. Counts reflect the data as of 2026-10-05 and refresh daily.

Canonical: https://intel.threadlinqs.com/vendors/mozilla
All vendors: https://intel.threadlinqs.com/vendors
Full detection coverage and IOCs via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp