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CVE-2025-4083— Process isolation bypass using "javascript:" URI links in cross-origin frames

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 138之前版本存在安全漏洞，该漏洞源于对javascript: URI处理不当，可能导致沙箱逃逸。

AI Predicted 8.6 Difficulty: Easy EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1055.001 · Dynamic-link Library Injection

Affected Version Matrix 5

VendorProduct Version RangeStatus
Mozilla Firefox 115.23≤ 115.* unaffected
128.10≤ 128.* unaffected
138≤ * unaffected
Mozilla Thunderbird 128.10≤ 128.* unaffected
138≤ * unaffected
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I. Basic Information for CVE-2025-4083

Vulnerability Information
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Vulnerability Title
Process isolation bypass using "javascript:" URI links in cross-origin frames
Source: CVE Program / CVE List V5
Vulnerability Description
A process isolation vulnerability in Thunderbird stemmed from improper handling of javascript: URIs, which could allow content to execute in the top-level document's process instead of the intended frame, potentially enabling a sandbox escape. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.
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 138之前版本存在安全漏洞，该漏洞源于对javascript: URI处理不当，可能导致沙箱逃逸。
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 115.23 ~ 115.* -
Mozilla Thunderbird 128.10 ~ 128.* -

II. Public POCs for CVE-2025-4083

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III. Intelligence Information for CVE-2025-4083

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Vendor Advisories for CVE-2025-4083 (5)

Same Patch Batch · Mozilla · 2025-04-29 · 13 CVEs total

CVE-2025-4093 Memory safety bug fixed in Firefox ESR 128.10 and Thunderbird 128.10
CVE-2025-4092 Memory safety bugs fixed in Firefox 138 and Thunderbird 138
CVE-2025-4091 Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderb
CVE-2025-4090 Leaked library paths in Thunderbird for Android
CVE-2025-4089 Potential local code execution in "copy as cURL" command
CVE-2025-4088 Cross-site request forgery via storage access API redirects
CVE-2025-4087 Unsafe attribute access during XPath parsing
CVE-2025-4086 Specially crafted filename could be used to obscure download type
CVE-2025-4085 Potential information leakage and privilege escalation in UITour actor
CVE-2025-4084 Potential local code execution in "copy as cURL" command
CVE-2025-4082 WebGL shader attribute memory corruption in Thunderbird for macOS
CVE-2025-2817 Privilege escalation in Thunderbird Updater

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2025-4083

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