CORS Bypass Vulnerability in Mozilla Thunderbird and Firefox Products
CVE-2025-8036
8.1HIGH
What is CVE-2025-8036?
A significant security flaw in Mozilla products, namely Firefox and Thunderbird, allows attackers to circumvent Cross-Origin Resource Sharing (CORS) protections through DNS rebinding. This vulnerability arises from the improper caching of CORS preflight responses when there are changes in IP addresses. As a result, untrusted origins can gain access to sensitive information, posing a serious risk to users of impacted versions.
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Affected Version(s)
Firefox < 141
Firefox ESR < 140.1
Thunderbird < 141
References
CVSS V3.1
Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged
Timeline
Vulnerability published
Vulnerability Reserved
Credit
Viktor Bocz