Red Hat Security Advisory: thunderbird security update
Multiple security vulnerabilities affecting Mozilla Thunderbird have been addressed in a Red Hat security update for Red Hat Enterprise Linux 9.4 Extended Update Support. The issues include privilege escalation in the Firefox Updater, unsafe attribute access during XPath parsing, process isolation bypass via "javascript:" URI links in cross-origin frames, and several memory safety bugs. These vulnerabilities have been fixed in Thunderbird version 128.10 and related Firefox versions. The update is rated as important by Red Hat Product Security.
AI Analysis
Technical Summary
This advisory covers five security vulnerabilities in Mozilla Thunderbird as packaged by Red Hat for RHEL 9.4 Extended Update Support. The vulnerabilities include CVE-2025-2817 (privilege escalation in Firefox Updater), CVE-2025-4087 (unsafe attribute access during XPath parsing), CVE-2025-4083 (process isolation bypass using "javascript:" URI links in cross-origin frames), and two memory safety bugs (CVE-2025-4091 and CVE-2025-4093) fixed in Thunderbird 128.10 and Firefox 138/ESR 128.10. Red Hat has released updated Thunderbird packages (version 128.10.0-1.el9_4) for multiple architectures to address these issues.
Potential Impact
The vulnerabilities could allow an attacker to escalate privileges, bypass process isolation, and exploit memory safety bugs, potentially leading to unauthorized actions or crashes within the Thunderbird mail client. The severity is rated as important by Red Hat, indicating a high risk if unpatched. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released updated Thunderbird packages version 128.10.0-1.el9_4 for Red Hat Enterprise Linux 9.4 Extended Update Support and related variants. Users should apply these official updates promptly to remediate the vulnerabilities. Detailed update instructions are available at https://access.redhat.com/articles/11258. Since this is an official fix, applying the update fully mitigates the issues.
Red Hat Security Advisory: thunderbird security update
Description
Multiple security vulnerabilities affecting Mozilla Thunderbird have been addressed in a Red Hat security update for Red Hat Enterprise Linux 9.4 Extended Update Support. The issues include privilege escalation in the Firefox Updater, unsafe attribute access during XPath parsing, process isolation bypass via "javascript:" URI links in cross-origin frames, and several memory safety bugs. These vulnerabilities have been fixed in Thunderbird version 128.10 and related Firefox versions. The update is rated as important by Red Hat Product Security.
Affected software
pkg:rpm/redhat/thunderbirdRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This advisory covers five security vulnerabilities in Mozilla Thunderbird as packaged by Red Hat for RHEL 9.4 Extended Update Support. The vulnerabilities include CVE-2025-2817 (privilege escalation in Firefox Updater), CVE-2025-4087 (unsafe attribute access during XPath parsing), CVE-2025-4083 (process isolation bypass using "javascript:" URI links in cross-origin frames), and two memory safety bugs (CVE-2025-4091 and CVE-2025-4093) fixed in Thunderbird 128.10 and Firefox 138/ESR 128.10. Red Hat has released updated Thunderbird packages (version 128.10.0-1.el9_4) for multiple architectures to address these issues.
Potential Impact
The vulnerabilities could allow an attacker to escalate privileges, bypass process isolation, and exploit memory safety bugs, potentially leading to unauthorized actions or crashes within the Thunderbird mail client. The severity is rated as important by Red Hat, indicating a high risk if unpatched. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released updated Thunderbird packages version 128.10.0-1.el9_4 for Red Hat Enterprise Linux 9.4 Extended Update Support and related variants. Users should apply these official updates promptly to remediate the vulnerabilities. Detailed update instructions are available at https://access.redhat.com/articles/11258. Since this is an official fix, applying the update fully mitigates the issues.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2025:7695
- Cve Count
- 5
- Additional Cves
- ["CVE-2025-4083","CVE-2025-4087","CVE-2025-4091","CVE-2025-4093"]
Threat ID: 6a4049e727e9c79719834c17
Added to database: 06/27/2026, 22:08:39 UTC
Last enriched: 06/27/2026, 22:35:39 UTC
Last updated: 09/10/2026, 19:36:49 UTC
Views: 26
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