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CVE-2026-113583

5.3 medium SSVC exploitation: none Deferred
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 3

  1. StatusPublished → DeferredNVD modified 2026-10-20 20:11
  2. StatusReceived → PublishedNVD modified 2026-10-20 11:35
  3. First seenCVSS 5.3NVD modified 2026-10-20 12:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 3