What’s Vulnerable › Vulnerabilities

CVE-2026-73524: Cypht < 2.12.2 XSS via FROM Email Header in Contacts Module

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-01 · updated 2026-09-08
• Weakness: CWE-79

Description

Cypht before 2.12.2 contains a cross-site scripting vulnerability in the contacts module that allows remote attackers to execute arbitrary script content by embedding malicious payloads within angle brackets in the FROM email header. The sanitization logic removes only the first occurrence of each angle bracket character, leaving additional angle brackets intact, which attackers exploit by delivering a crafted email whose FROM header executes script in the victim's browser when the user opens the message and accesses the Add Local Contacts function.

Affected products

• cypht-org cypht: before 2.12.2 — fixed in 2.12.2

How to fix

Upgrade to a fixed version: cypht-org cypht 2.12.2. Check the vendor advisory for mitigations.

References

• https://github.com/cypht-org/cypht/commit/372343783b3d21c12f74bb88d0eef36c1579c062
• https://github.com/cypht-org/cypht/pull/2072
• https://github.com/cypht-org/cypht/releases/tag/v2.12.2
• https://www.vulncheck.com/advisories/cypht-xss-via-from-email-header-in-contacts-module

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