{"id":"CVE-2026-113583","published":"2026-10-20T12:17:29.900","lastModified":"2026-10-22T22:18:04.110","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.","cvssScore":6.1,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cwes":["CWE-79"],"vendors":[],"products":[],"references":[{"url":"https://github.com/cypht-org/cypht/pull/2118/changes/75d2fb83d228be2aaa37036a11eea68d82122d85","tags":[]},{"url":"https://github.com/cypht-org/cypht/releases#release-v2.13.0","tags":[]},{"url":"https://www.vulncheck.com/advisories/cypht-through-stored-dom-xss-via-externalresources-js","tags":[]}],"exploitRefs":[{"url":"https://github.com/cypht-org/cypht/pull/2118/changes/75d2fb83d228be2aaa37036a11eea68d82122d85","tags":[]},{"url":"https://github.com/cypht-org/cypht/releases#release-v2.13.0","tags":[]}],"hasPoc":true,"ai":null}