CVE-2026-113583
Description
Cypht webmail 2.0.0 through 2.12.2 contains a DOM-based cross-site scripting vulnerability that allows remote attackers to execute arbitrary JavaScript by crafting malicious alt text or URL values in an HTML email's external image tag when ALLOW_EXTERNAL_IMAGE_SOURCES is enabled. Attackers can send a specially crafted email so that when the victim opens it, the externalResources.js code builds the blocked-image notice using innerHTML with decoded email-derived values, triggering script execution in the victim's authenticated session to read mailboxes, send email, or change settings.
How to fix
- cypht-org cypht2.13.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cypht-org cypht | 2.0.0 ≤ v < 2.13.0 | 2.13.0 |
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