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

Status: published. Published: 2026-09-01. Updated: 2026-11-08.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/cypht-org/cypht/pull/2072
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/cypht-org/cypht/commit/372343783b3d21c12f74bb88d0eef36c1579c062

## Affected products and versions

- cypht-org / cypht (cypht-org/cypht): ≥ 0; < 2.12.2 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 5.1 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 6.1 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.41% as of 2026-11-08; percentile 35.27%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-79

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/cypht-org/cypht/releases/tag/v2.12.2 (CNA: VulnCheck; release-notes)

- https://github.com/cypht-org/cypht/pull/2072 (CNA: VulnCheck; issue-tracking, patch)

- https://github.com/cypht-org/cypht/commit/372343783b3d21c12f74bb88d0eef36c1579c062 (CNA: VulnCheck; patch)

- https://www.vulncheck.com/advisories/cypht-xss-via-from-email-header-in-contacts-module (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-73524; retrieved 2026-11-08; source updated 2026-11-08

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-73524; retrieved 2026-11-08; source updated Not reported

Revision: 7f7c6b93c4d460929d624273405b93d92779279494257787fc7f995ffff9e74d

Canonical: https://y2.dev/cve/CVE-2026-73524

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