CVE-2025-4089

Description

Due to insufficient escaping of special characters in the "copy as cURL" feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system. This vulnerability affects Firefox < 138 and Thunderbird < 138.

Category

5.1
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/buglist.cgi?bug_id=1949994%2C1956698%2C1960198 broken link
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-2025-4089?
CVE-2025-4089 has been scored as a medium severity vulnerability.
How to fix CVE-2025-4089?
To fix CVE-2025-4089, 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-2025-4089 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-4089 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-2025-4089?
CVE-2025-4089 affects Mozilla Firefox, Mozilla Thunderbird.
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