CVE-2025-1015

Description

The Thunderbird Address Book URI fields contained unsanitized links. This could be used by an attacker to create and export an address book containing a malicious payload in a field. For example, in the “Other” field of the Instant Messaging section. If another user imported the address book, clicking on the link could result in opening a web page inside Thunderbird, and that page could execute (unprivileged) JavaScript. This vulnerability affects Thunderbird < 128.7 and Thunderbird < 135.

Category

5.4
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 22.79% Top 5%
Vendor Advisory mozilla.org
Affected: Mozilla Thunderbird
Affected: Mozilla Thunderbird
Published at:
Updated at:

References

Link Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1939458 permissions required
https://www.mozilla.org/security/advisories/mfsa2025-10/ vendor advisory
https://www.mozilla.org/security/advisories/mfsa2025-11/

Frequently Asked Questions

What is the severity of CVE-2025-1015?
CVE-2025-1015 has been scored as a medium severity vulnerability.
How to fix CVE-2025-1015?
To fix CVE-2025-1015, 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-2025-1015 being actively exploited in the wild?
It is possible that CVE-2025-1015 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~23% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-1015?
CVE-2025-1015 affects Mozilla Thunderbird, Mozilla Thunderbird.
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