CVE-2026-113583
Cypht 2.0.0 through 2.12.2 Stored DOM XSS via externalResources.js
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | cypht-org |
| Product | cypht |
| Published | Oct 20, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
cypht-org / cypht
2.0.0 < 2.13.0
References
Credits
Anonymous