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OpenAdvisories
High ALSA-2025:7507 8 CVEs

Important: thunderbird security update

Published May 13, 2025 · Updated Oct 29, 2026

Ecosystem: AlmaLinux

Summary

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

* thunderbird: User Interface (UI) Misrepresentation of attachment URL (CVE-2025-3523)
* thunderbird: Information Disclosure of /tmp directory listing (CVE-2025-2830)
* thunderbird: Leak of hashed Window credentials via crafted attachment URL (CVE-2025-3522)
* firefox: thunderbird: Privilege escalation in Firefox Updater (CVE-2025-2817)
* firefox: thunderbird: Unsafe attribute access during XPath parsing (CVE-2025-4087)
* firefox: thunderbird: Process isolation bypass using "javascript:" URI links in cross-origin frames (CVE-2025-4083)
* firefox: thunderbird: Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10 (CVE-2025-4091)
* firefox: thunderbird: Memory safety bug fixed in Firefox ESR 128.10 and Thunderbird 128.10 (CVE-2025-4093)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Fixed packages 1

ReleasePackageFixed in
AlmaLinux · 10 thunderbird 128.10.0-1.el10_0.alma.1

Vulnerabilities 8

  • Critical 9.1
    CVE-2025-4083

    Process isolation bypass using "javascript:" URI links in cross-origin frames

    A process isolation vulnerability in Thunderbird stemmed from improper handling of javascript: URIs, which could allow content to execute in the top-level document's process instead of the intended frame, potentially enabling a sandbox escape. This vulnerabil…

    Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi
  • High 8.8
    CVE-2025-2817

    Privilege escalation in Thunderbird Updater

    Thunderbird's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an attacker could bypass intended access controls,…

    Mozilla Firefox Thunderbird firefox Browsers Wolfi
  • High 8.1
    CVE-2025-4091

    Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10

    Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.…

    Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi
  • High 8.1
    CVE-2025-4093

    Memory safety bug fixed in Firefox ESR 128.10 and Thunderbird 128.10

    Memory safety bug present in Firefox ESR 128.9, and Thunderbird 128.9. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox ESR 128.1…

    Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi
  • Medium 6.4
    CVE-2025-3523

    User Interface (UI) Misrepresentation of attachment URL

    When an email contains multiple attachments with external links via the X-Mozilla-External-Attachment-URL header, only the last link is shown when hovering over any attachment. Although the correct link is used on click, the misleading hover text could trick …

    Mozilla Thunderbird thunderbird thunderbird Debian Ubuntu
  • Medium 6.3
    CVE-2025-2830

    Information Disclosure of /tmp directory listing

    By crafting a malformed file name for an attachment in a multipart message, an attacker can trick Thunderbird into including a directory listing of /tmp when the message is forwarded or edited as a new message. This vulnerability could allow attackers to disc…

    Mozilla Thunderbird thunderbird thunderbird Debian Ubuntu
  • Medium 6.3
    CVE-2025-3522

    Leak of hashed Window credentials via crafted attachment URL

    Thunderbird processes the X-Mozilla-External-Attachment-URL header to handle attachments which can be hosted externally. When an email is opened, Thunderbird accesses the specified URL to determine file size, and navigates to it when the user clicks the attac…

    Mozilla Thunderbird thunderbird thunderbird Debian Ubuntu
  • Medium 4.8
    CVE-2025-4087

    Unsafe attribute access during XPath parsing

    A vulnerability was identified in Thunderbird where XPath parsing could trigger undefined behavior due to missing null checks during attribute access. This could lead to out-of-bounds read access and potentially, memory corruption. This vulnerability was fixe…

    Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi

References

  • report
    https://access.redhat.com/security/cve/CVE-2025-2817
  • report
    https://access.redhat.com/security/cve/CVE-2025-2830
  • report
    https://access.redhat.com/security/cve/CVE-2025-3522
  • report
    https://access.redhat.com/security/cve/CVE-2025-3523
  • report
    https://access.redhat.com/security/cve/CVE-2025-4083
  • report
    https://access.redhat.com/security/cve/CVE-2025-4087
  • report
    https://access.redhat.com/security/cve/CVE-2025-4091
  • report
    https://access.redhat.com/security/cve/CVE-2025-4093
  • report
    https://bugzilla.redhat.com/2359786
  • report
    https://bugzilla.redhat.com/2359789
  • report
    https://bugzilla.redhat.com/2359793
  • report
    https://bugzilla.redhat.com/2362902
  • report
    https://bugzilla.redhat.com/2362904
  • report
    https://bugzilla.redhat.com/2362907
  • report
    https://bugzilla.redhat.com/2362912
  • report
    https://bugzilla.redhat.com/2362915
  • advisory
    https://errata.almalinux.org/10/ALSA-2025-7507.html