CVE-2026-113583
CVE-2026-113583 · Cypht 2.0.0 through 2.12.2 Stored DOM XSS via externalResources.js
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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.
CVSS 5.3 · Medium · EPSS 0.3% · Fix available
- Published
- Updated
Affected products and versions
cypht
- Versions
- ≥ 2.0.0, < 2.13.0: Affected (semver)
Update to 2.13.0