CVE-2025-1015: Unsanitized address book fields
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 was fixed in Thunderbird 128.7 and Thunderbird 135.
Other sources
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.
— Red Hat
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 135 - Upgrade
Upgrade
ubuntu/thunderbirdto a version that resolves this vulnerability.Fixed in 1:128.12.0+build1-0ubuntu0.22.04.1 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 128.7 - Upgrade
Upgrade
debian/thunderbirdto a version that resolves this vulnerability.Fixed in 1:140.12.0esr-1~deb12u1Fixed in 1:153.6.0esr-1~deb12u1Fixed in 1:140.12.0esr-1~deb13u1Fixed in 1:153.5.1esr-1~deb13u2Fixed in 1:153.5.0esr-1Fixed in 1:153.6.0esr-1 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 128.7
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2025-1015?
The severity of CVE-2025-1015 is considered high due to the potential for a malicious payload being executed when an address book is imported.
How do I fix CVE-2025-1015?
To fix CVE-2025-1015, upgrade to Thunderbird version 128.8 or later, which addresses the vulnerability.
What type of attacks can exploit CVE-2025-1015?
CVE-2025-1015 can be exploited through crafted address books that contain unsanitized links leading to potential phishing or malware attacks.
Who is affected by CVE-2025-1015?
Users of Mozilla Thunderbird versions up to 128.7 are affected by CVE-2025-1015 and should take immediate action to upgrade.
What should I do if I have already imported an affected address book related to CVE-2025-1015?
If you have imported an affected address book related to CVE-2025-1015, it is recommended to delete the imported contacts and scan your system for potential malware.