CVE-2026-73524
CVE-2026-73524
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (33.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.002
Weakness classification (CWE)
References
- github.com/cypht-org/cypht/releases/tag/v2.12.2 (release-notes)
- github.com/cypht-org/cypht/pull/2072 (issue-tracking)
- github.com/cypht-org/cypht/commit/372343783b3d21c12f74bb88d0eef36c1579c062 (patch)
- www.vulncheck.com/advisories/cypht-xss-via-from-email-header-in-contacts-module (third-party-advisory)
Frequently asked questions
- What is CVE-2026-73524?
- CVE-2026-73524 is a medium-severity vulnerability, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-09-01.
- How severe is CVE-2026-73524?
- Medium severity. CVSS v3 base score is 6.1 out of 10.