Low [CVE-2026-2790] Same-origin policy bypass in the Networking: JAR component
This low-severity Red Hat Linux advisory covers CVE-2026-2790 affecting Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 7.
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Summary
Same-origin policy bypass in the Networking: JAR component. Red Hat rates this low (CVSS 3.4).
Affected package(s): thunderbird, firefox. Resolved in Red Hat advisory RHSA-2026:3984 — update the affected packages (`sudo dnf update`).
Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 1.
- thunderbird-0:140.8.0-1.el9_0
- thunderbird-0:140.8.0-1.el8_6
- thunderbird-0:140.8.0-1.el9_6
- thunderbird-0:140.8.0-1.el8_8
- thunderbird-0:140.8.0-1.el9_7
- thunderbird-0:140.8.0-1.el8_2
- thunderbird-0:140.8.0-1.el9_2
- thunderbird-0:140.8.0-1.el9_4
- thunderbird-0:140.8.0-1.el8_10
- firefox-0:140.8.0-2.el8_2
- firefox-0:140.8.0-2.el9_0
- firefox-0:140.8.0-2.el8_4
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- RHSA-2026:3984
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Update the affected package(s) to the fixed version shipped in RHSA-2026:3984 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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