MEDIUM 5.3 NVD
CVE-2026-113583
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 craft
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.
References
- https://github.com/cypht-org/cypht/pull/2118/changes/75d2fb83d228be2aaa37036a11eea68d82122
- https://github.com/cypht-org/cypht/releases#release-v2.13.0
- https://www.vulncheck.com/advisories/cypht-through-stored-dom-xss-via-externalresources-js
This medium severity vulnerability with a CVSS score of 5.3 was published on 2026-10-20 via NVD.
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