Medium [CVE-2026-88859] javascript execution via spoofed vCard control bypasses mail script-markup restriction
This medium-severity Red Hat Linux advisory covers CVE-2026-88859 affecting Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8.
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Summary
A flaw was found in Evolution. A remote attacker can exploit this vulnerability by sending a specially crafted HTML email containing a spoofed vCard control.
When a victim clicks on this control, Evolution's trusted JavaScript handler incorrectly assigns an attacker-controlled JavaScript URL to an iframe's source. This action leads to arbitrary JavaScript execution within the mail-viewing context, effectively bypassing the security measures designed to prevent script execution in email content.
Red Hat severity: Moderate — CVSS 6.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L). Weakness: CWE-84.
Affected Red Hat products: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Will not fix / out of support: Red Hat Enterprise Linux 6.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: evolution.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 51 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 51 minutes ago·verify at source
Mitigation checklist
- To mitigate this issue, users can disable JavaScript execution for HTML mail in Evolution. This can be done through the Evolution preferences or by using `gsettings`. Disabling JavaScript may affect the rendering and functionality of some legitimate HTML emails. To disable JavaScript via `gsettings`, execute the following command: `gsettings set org.gnome.evolution.mail enable-javascript false` To revert this change, execute: `gsettings set org.gnome.evolution.mail enable-javascript true` Note that changes to `gsettings` take effect immediately, but Evolution may need to be restarted for the setting to be fully applied to already open mail views.
Official advisory · high-confidence parse· fetched 51 minutes ago·verify at source
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