JavaScript Execution Vulnerability in Mozilla Thunderbird and Firefox
CVE-2025-8029

8.1HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
22 July 2025

What is CVE-2025-8029?

A security flaw in Mozilla Thunderbird and Firefox allows for potential execution of JavaScript from javascript: URLs embedded in object and embed tags. This could lead to unauthorized actions or unwanted behavior when users interact with affected versions. Users are advised to upgrade to the latest versions to mitigate risks associated with this vulnerability.

Affected Version(s)

Firefox < 141

Firefox ESR < 128.13

Firefox ESR < 140.1

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1928021
https://www.mozilla.org/security/advisories/mfsa2025-56/
https://www.mozilla.org/security/advisories/mfsa2025-58/

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

Mirko Brodesser
.