Cypht 2.0.0 through 2.12.2 Stored DOM XSS via externalResources.js
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.
CVE-2026-113583
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-113583
cypht
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/cypht-org/cypht",
"vendor": "cypht-org",
"product": "cypht",
"versions": [
{
"status": "affected",
"version": "2.0.0",
"lessThan": "2.13.0",
"versionType": "semver"
}
],
"packageURL": "pkg:github/cypht-org/cypht",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-113583
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #52928 · Revision 1
- Added to Heist Feed
- Publisher date