Evolution: evolution: javascript execution via spoofed vcard control bypasses mail script-markup restriction
Summary
| CVE | CVE-2026-88859 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-10 12:16:33 UTC |
| Updated | 2026-09-10 16:18:10 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 6.3 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Problem Types: CWE-84 | CWE-84 Improper Neutralization of Encoded URI Schemes in a Web Page
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 6.3 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L |
| 3.1 | CNA | CVSS | 6.3 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Red Hat | Red Hat Enterprise Linux 6 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 7 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| bugzilla.redhat.com/show_bug.cgi | [email protected] | bugzilla.redhat.com | |
| gitlab.gnome.org/GNOME/evolution/-/work_items/3388 | [email protected] | gitlab.gnome.org | |
| access.redhat.com/security/cve/CVE-2026-88859 | [email protected] | access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Red Hat would like to thank Jurre van Bergen for reporting this issue. (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-09-10T10:44:06.078Z | Reported to Red Hat. |
| CNA | 2026-09-10T11:00:00.000Z | Made public. |
Workarounds
CNA: 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.