{"id":71656,"date":"2025-09-05T20:57:07","date_gmt":"2025-09-05T20:57:07","guid":{"rendered":""},"modified":"2025-09-12T02:14:59","modified_gmt":"2025-09-12T08:14:59","slug":"cve-2025-9180-critical-same-origin-policy-bypass-vulnerability-in-firefox-and-thunderbird","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-9180-critical-same-origin-policy-bypass-vulnerability-in-firefox-and-thunderbird\/","title":{"rendered":"CVE-2025-9180: Critical Same-Origin Policy Bypass Vulnerability in Firefox and Thunderbird<\/strong>"},"content":{"rendered":"

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

The CVE-2025-9180 is a high-risk vulnerability scored at 8.1 on the CVSS scale, which is found in the Graphics: Canvas2D component of Mozilla Firefox and Thunderbird. It enables an attacker to bypass the same-origin policy, a critical security component that restricts how a document or script loaded from one origin can interact with a resource from another origin. This vulnerability can lead to potential system compromise or data<\/a> leakage, posing a significant threat to user data and system integrity.
\nIt’s not just a concern for individual users, but also for organizations that rely on these popular web browsers and email clients for their daily operations. Understanding the implications of this vulnerability and applying appropriate mitigations is crucial to maintain secure<\/a> online environments.<\/p>\n

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

CVE ID: CVE-2025-9180
\nSeverity: High (CVSS: 8.1)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: Required
\nImpact: Potential System<\/a> Compromise and Data Leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

Firefox | < 142\nFirefox ESR | < 115.27, < 128.14, < 140.2\nThunderbird | < 142, < 128.14, < 140.2\n\nHow the Exploit Works<\/strong><\/p>\n

This exploit takes advantage of a flaw in the Graphics: Canvas2D component that fails to properly enforce the same-origin policy. The same-origin policy is a crucial security concept that prevents scripts on one web page from accessing<\/a> data on another web page unless both pages have the same origin.
\nHowever, with CVE-2025-9180, an attacker can craft a malicious script that bypasses<\/a> this policy and accesses data from different origins. This could allow an attacker to steal sensitive user<\/a> data from other web pages or even perform actions on behalf of the user without their knowledge or consent.<\/p>\n

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

Below is a conceptual example of how this vulnerability might be exploited. An attacker might craft a malicious JavaScript code<\/a> that targets the Canvas2D component to bypass the same-origin policy.<\/p>\n

var canvas = document.createElement('canvas');\nvar ctx = canvas.getContext('2d');\nvar img = new Image();\nimg.crossOrigin = 'Anonymous';\nimg.onload = function() {\nctx.drawImage(img, 0, 0);\nvar data = ctx.getImageData(0, 0, img.width, img.height);\n\/\/ send data to attacker's server\n}\nimg.src = 'http:\/\/target-site.com\/private-image.jpg';\ndocument.body.appendChild(canvas);<\/code><\/pre>\n
In this example, the attacker creates an image element and sets its `crossOrigin` attribute to `’Anonymous’` to bypass<\/a> the same-origin policy. They then draw the image onto a canvas and extract its data, which could include sensitive information<\/a> that they can send to their own server. This code could be delivered to a victim’s browser through a range of methods, such as cross-site scripting<\/a> (XSS) attacks or malicious advertisements.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The CVE-2025-9180 is a high-risk vulnerability scored at 8.1 on the CVSS scale, which is found in the Graphics: Canvas2D component of Mozilla Firefox and Thunderbird. It enables an attacker to bypass the same-origin policy, a critical security component that restricts how a document or script loaded from one origin can interact with a […]<\/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":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[81],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-71656","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-xss"],"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