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 8.8 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 corresponding Firefox versions.
AI Analysis
Technical Summary
This Red Hat security advisory covers five vulnerabilities in Mozilla Thunderbird and Firefox components used by Thunderbird. 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. The update is provided for Red Hat Enterprise Linux 8.8 Extended Update Support across multiple architectures. The advisory references fixes in Thunderbird 128.10.0-1.el8_8 packages.
Potential Impact
The vulnerabilities include privilege escalation, unsafe attribute access, process isolation bypass, and memory safety issues. These could potentially allow an attacker to escalate privileges, bypass security boundaries, or cause memory corruption leading to crashes or code execution. The Red Hat advisory rates the overall impact as Important (high severity). 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.el8_8) for Red Hat Enterprise Linux 8.8 Extended Update Support that address these vulnerabilities. Users should apply the provided security update promptly to remediate these issues. For detailed update instructions, refer to the Red Hat article at https://access.redhat.com/articles/11258. There is no indication that additional mitigations are required beyond applying this official patch.
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 8.8 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 corresponding Firefox versions.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This Red Hat security advisory covers five vulnerabilities in Mozilla Thunderbird and Firefox components used by Thunderbird. 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. The update is provided for Red Hat Enterprise Linux 8.8 Extended Update Support across multiple architectures. The advisory references fixes in Thunderbird 128.10.0-1.el8_8 packages.
Potential Impact
The vulnerabilities include privilege escalation, unsafe attribute access, process isolation bypass, and memory safety issues. These could potentially allow an attacker to escalate privileges, bypass security boundaries, or cause memory corruption leading to crashes or code execution. The Red Hat advisory rates the overall impact as Important (high severity). 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.el8_8) for Red Hat Enterprise Linux 8.8 Extended Update Support that address these vulnerabilities. Users should apply the provided security update promptly to remediate these issues. For detailed update instructions, refer to the Red Hat article at https://access.redhat.com/articles/11258. There is no indication that additional mitigations are required beyond applying this official patch.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2025:7689
- Cve Count
- 5
- Additional Cves
- ["CVE-2025-4083","CVE-2025-4087","CVE-2025-4091","CVE-2025-4093"]
Threat ID: 6a4049e727e9c79719834c3f
Added to database: 06/27/2026, 22:08:39 UTC
Last enriched: 06/27/2026, 22:36:08 UTC
Last updated: 09/10/2026, 19:36:49 UTC
Views: 25
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