Bug#1147400: evolution: CVE-2026-88859

[Salvatore Bonaccorso]

Source: evolution
Version: 3.56.2-10
Severity: important
Tags: security upstream
Forwarded: https://gitlab.gnome.org/GNOME/evolution/-/work_items/3388
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for evolution.

CVE-2026-88859[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-88859
    https://www.cve.org/CVERecord?id=CVE-2026-88859
[1] https://gitlab.gnome.org/GNOME/evolution/-/work_items/3388
[2] https://gitlab.gnome.org/GNOME/evolution/-/commit/a6f37ef58f9889e361022d46e70b8a53b6f9fd97

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore