CVE-2025-4088

Description

A security vulnerability in Thunderbird allowed malicious sites to use redirects to send credentialed requests to arbitrary endpoints on any site that had invoked the Storage Access API. This enabled potential Cross-Site Request Forgery attacks across origins. This vulnerability affects Firefox < 138 and Thunderbird < 138.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.02%
Vendor Advisory mozilla.org Vendor Advisory mozilla.org
Affected: Mozilla Firefox
Affected: Mozilla Thunderbird
Published at:
Updated at:

References

Link Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1953521 permissions required
https://www.mozilla.org/security/advisories/mfsa2025-28/ vendor advisory
https://www.mozilla.org/security/advisories/mfsa2025-31/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2025-4088?
CVE-2025-4088 has been scored as a medium severity vulnerability.
How to fix CVE-2025-4088?
To fix CVE-2025-4088, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-4088 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-4088 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-4088?
CVE-2025-4088 affects Mozilla Firefox, Mozilla Thunderbird.
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