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CVE-2025-5266— Script element events leaked cross-origin resource status

Quick assessment

Affected
Mozilla Firefox
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mozilla Firefox是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 139之前版本和Firefox ESR 128.11之前版本存在安全漏洞，该漏洞源于脚本元素加载跨源资源导致信息泄露，可能引发XS-Leaks攻击。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.30% · P22

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System
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I. Basic Information for CVE-2025-5266

Vulnerability Information
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Vulnerability Title
Script element events leaked cross-origin resource status
Source: CVE Program / CVE List V5
Vulnerability Description
Script elements loading cross-origin resources generated load and error events which leaked information enabling XS-Leaks attacks. This vulnerability was fixed in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Mozilla Firefox 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 139之前版本和Firefox ESR 128.11之前版本存在安全漏洞，该漏洞源于脚本元素加载跨源资源导致信息泄露，可能引发XS-Leaks攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla Firefox 128.11 ~ 128.* -
Mozilla Thunderbird 128.11 ~ 128.* -

II. Public POCs for CVE-2025-5266

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III. Intelligence Information for CVE-2025-5266

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Vendor Advisories for CVE-2025-5266 (4)

Same Patch Batch · Mozilla · 2025-05-27 · 11 CVEs total

CVE-2025-5272 Memory safety bugs fixed in Firefox 139 and Thunderbird 139
CVE-2025-5270 SNI was sometimes unencrypted
CVE-2025-5271 Devtools' preview ignored CSP headers
CVE-2025-5269 Memory safety bug fixed in Firefox ESR 128.11 and Thunderbird 128.11
CVE-2025-5268 Memory safety bugs fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and Thunderb
CVE-2025-5267 Clickjacking vulnerability could have led to leaking saved payment card details
CVE-2025-5264 Potential local code execution in “Copy as cURL” command
CVE-2025-5265 Potential local code execution in “Copy as cURL” command
CVE-2025-5263 Error handling for script execution was incorrectly isolated from web content
CVE-2025-5262 Mozilla Thunderbird 安全漏洞

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2025-5266

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