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MEDIUM

CVE-2025-1015

CVSS v3

5.4

MEDIUM

EPSS Score

1.4 %

exploit probability, as of 2026-10-22

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • thunderbirdAlmaLinux:9all versions · fixed in 128.7.0-1.el9_5.alma.1
  • thunderbirdAlmaLinux:8all versions · fixed in 128.7.0-1.el8_10.alma.1

Vendor advisories

  • CVE-2025-1015 Red Hat Product Security118 products fixed · 8 known affected

    thunderbird: Unsanitized address book fields

    thunderbird as a component of Red Hat Enterprise Linux 10 · thunderbird-flatpak-container as a component of Red Hat Enterprise Linux 10 · thunderbird.src as a component of Red Hat Enterprise Linux 10

  • RHSA-2025:1348 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2025:1341 Red Hat Product Security21 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2025:1340 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2025:1339 Red Hat Product Security15 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2025:1318 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: thunderbird security update

4 more advisories

Full record on NVD

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.

Technical details

Published
2025-02-04

Frequently asked questions

What is CVE-2025-1015?

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.

Is CVE-2025-1015 actively exploited?

Active exploitation of CVE-2025-1015 has not been confirmed. Its EPSS score was 1.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-1015?

CVE-2025-1015 has a CVSS v3 base score of 5.4 (MEDIUM severity).

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