CVE-2026-88859 Evolution: evolution: javascript execution via spoofed vcard control bypasses mail script-markup restriction
Remote attackers can execute arbitrary JavaScript in Evolution by sending crafted emails with spoofed vCard controls, bypassing script restrictions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-88859?
CVE-2026-88859 is a medium-severity cross-site scripting vulnerability in Red Hat Enterprise Linux 6, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-84
Which versions are affected by CVE-2026-88859?
How do I fix CVE-2026-88859?
Apply the vendor's patch.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-88859 being exploited?
There is no known exploitation of CVE-2026-88859 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-88859, GHSA-8j98-q77q-pmv2, MGASA-2026-0554, UBUNTU-CVE-2026-88859.