{"id":86981,"date":"2026-04-24T10:05:10","date_gmt":"2026-04-24T10:05:10","guid":{"rendered":""},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-30T00:00:00","slug":"cve-2025-10535-critical-vulnerability-in-firefox-143-leading-to-potential-system-compromise-or-data-leakage","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-10535-critical-vulnerability-in-firefox-143-leading-to-potential-system-compromise-or-data-leakage\/","title":{"rendered":"CVE-2025-10535: Critical Vulnerability in Firefox < 143 Leading to Potential System Compromise or Data Leakage<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

This report explores CVE-2025-10535, a prominent vulnerability affecting versions of Firefox browser below 143. This vulnerability is of significant importance due to its potential to compromise systems and lead to data leakage, affecting both individual users and corporate entities. Unpatched systems are at risk, and the need for immediate remediation is paramount.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-10535
\nSeverity: High (7.5 CVSS)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: Required
\nImpact: System compromise and potential data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Firefox | < 143\n\nHow the Exploit Works<\/strong><\/p>\n

The vulnerability CVE-2025-10535 exploits a flaw in the security design of Firefox versions below 143. An attacker can craft a malicious website or script that, when interacted with by a user, can execute arbitrary code on the user’s system. This can lead to a full system compromise or data leakage.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Here’s a conceptual example of how the vulnerability might be exploited through a malicious website:<\/p>\n

GET \/malicious\/script.js HTTP\/1.1\nHost: malicious.example.com\nUser-Agent: Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:142.0) Gecko\/20100101 Firefox\/142.0\nAccept: text\/html,application\/xhtml+xml,application\/xml;q=0.9,*\/*;q=0.8\nAccept-Language: en-US,en;q=0.5\nAccept-Encoding: gzip, deflate\nConnection: close<\/code><\/pre>\n
In this example, a user with an affected version of Firefox visits a malicious website. The website serves a script (script.js) that takes advantage of the vulnerability, leading to a potential system compromise or data leakage.<\/p>\n
Mitigation & Recommendations<\/strong><\/p>\n
Users are strongly advised to update their Firefox browser to the latest version to mitigate this vulnerability. If an immediate update is not possible, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) is recommended as a temporary measure. Users should remain cautious while browsing, avoiding unfamiliar or suspicious websites.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview This report explores CVE-2025-10535, a prominent vulnerability affecting versions of Firefox browser below 143. This vulnerability is of significant importance due to its potential to compromise systems and lead to data leakage, affecting both individual users and corporate entities. Unpatched systems are at risk, and the need for immediate remediation is paramount. Vulnerability Summary […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-86981","post","type-post","status-publish","format-standard","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t