Red Hat Security Advisory: firefox security update
Multiple security vulnerabilities affecting Mozilla Firefox and Thunderbird have been addressed in a Red Hat Enterprise Linux 8.8 Extended Update Support release. These 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. The update fixes these issues in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. The vulnerabilities have been rated as important by Red Hat Product Security.
AI Analysis
Technical Summary
This Red Hat security advisory addresses five vulnerabilities in Mozilla Firefox and Thunderbird, including 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 Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. The advisory provides updated packages for Red Hat Enterprise Linux 8.8 Extended Update Support across multiple architectures. No CVSS scores are provided in the advisory, but the issues are rated as important by Red Hat.
Potential Impact
The vulnerabilities include privilege escalation, unsafe attribute access, process isolation bypass, and memory safety bugs, which could potentially allow attackers to escalate privileges, bypass security boundaries, or cause memory corruption. These issues affect Firefox and Thunderbird versions distributed with Red Hat Enterprise Linux 8.8 Extended Update Support. No known exploits in the wild have been reported at the time of the advisory.
Mitigation Recommendations
Red Hat has released updated Firefox and Thunderbird packages for Red Hat Enterprise Linux 8.8 Extended Update Support that address these vulnerabilities. Users should apply the provided security updates as detailed in the Red Hat advisory (RHSA-2025:7543) and the referenced article https://access.redhat.com/articles/11258. Patch status is confirmed as fixed in these updated packages. No additional mitigation steps are indicated by the vendor.
Red Hat Security Advisory: firefox security update
Description
Multiple security vulnerabilities affecting Mozilla Firefox and Thunderbird have been addressed in a Red Hat Enterprise Linux 8.8 Extended Update Support release. These 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. The update fixes these issues in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. The vulnerabilities have been rated as important by Red Hat Product Security.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This Red Hat security advisory addresses five vulnerabilities in Mozilla Firefox and Thunderbird, including 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 Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. The advisory provides updated packages for Red Hat Enterprise Linux 8.8 Extended Update Support across multiple architectures. No CVSS scores are provided in the advisory, but the issues are rated as important by Red Hat.
Potential Impact
The vulnerabilities include privilege escalation, unsafe attribute access, process isolation bypass, and memory safety bugs, which could potentially allow attackers to escalate privileges, bypass security boundaries, or cause memory corruption. These issues affect Firefox and Thunderbird versions distributed with Red Hat Enterprise Linux 8.8 Extended Update Support. No known exploits in the wild have been reported at the time of the advisory.
Mitigation Recommendations
Red Hat has released updated Firefox and Thunderbird packages for Red Hat Enterprise Linux 8.8 Extended Update Support that address these vulnerabilities. Users should apply the provided security updates as detailed in the Red Hat advisory (RHSA-2025:7543) and the referenced article https://access.redhat.com/articles/11258. Patch status is confirmed as fixed in these updated packages. No additional mitigation steps are indicated by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2025:7543
- Cve Count
- 5
- Additional Cves
- ["CVE-2025-4083","CVE-2025-4087","CVE-2025-4091","CVE-2025-4093"]
Threat ID: 6a4049e827e9c79719835260
Added to database: 06/27/2026, 22:08:40 UTC
Last enriched: 06/27/2026, 22:36:27 UTC
Last updated: 09/10/2026, 19:36:49 UTC
Views: 26
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