CVE-2026-73524: Cypht < 2.12.2 XSS via FROM Email Header in Contacts Module
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
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.
Description quoted from the CVE record (assigned by VulnCheck, published 2026-09-01).
Weakness: Improper Neutralization of Input During Web Page Generation (‘Cross-site Scripting’)
How it can be exploited
Exploitable over the network with low attack complexity with no special attack requirements needing no privileges and a user must actively take an action. Impact: confidentiality none, integrity none, availability none. 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 assessment (SSVC): CISA has no evidence of exploitation. Automatable: no. Technical impact: partial.
Public exploit evidence (Exploit Observer)
Also known as: EUVD-2026-69652, GHSA-r7q3-25g3-96cc
VEDAS cluster: VEDAS:DELIGHTFULDUNE
Exploit Observer links 3 pieces of public exploit code or detection modules that name this CVE or one of its aliases.
Exploit code and modules (3)
Code that names this CVE. A repository can be a working exploit, a scanner, a fake or malware; read it before running anything.
- Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/suricata/2026/CVE-2026-73524.rules
- Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/suricata/2026/CVE-2026-73524.rules
- Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/suricata/2026/CVE-2026-73524.rules
Vulnerability databases and vendor advisories (3)
Catalogue entries, not exploit evidence.
- Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2026-69652
- Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-r7q3-25g3-96cc
- Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-73524
2 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.
VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.
Live scores
- EPSS
- 0.004
low predicted chance of attack - VEDAS
- 0.985
strong exploit evidence - On CISA KEV
- Not listed
- Detection rule
- Suricata
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| cypht-org cypht | before 2.12.2 | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
How to fix it
Fixed versions stated in the CVE record: 2.12.2.
Vendor guidance:
- Release Notes (release-notes)
- Patch Commit (patch)
How to detect it
Suricata rules (network detection)
1 rule that alert on traffic matching this exploit: VEDAS CVE-2026-73524 Cypht - Stored Cross-Site Scripting via crafted From header. Add them to your Suricata rule set and reload.
Show the rules
alert smtp $EXTERNAL_NET any -> $HOME_NET any (msg:"VEDAS CVE-2026-73524 Cypht - Stored Cross-Site Scripting via crafted From header"; flow:established,to_server; content:"From:"; nocase; fast_pattern; pcre:"/^From:[^\r\n]*<\s*\/?(script|img|svg|iframe|body|object|embed|details|video|audio|a\s)/im"; classtype:web-application-attack; reference:cve,CVE-2026-73524; reference:url,https://www.exploit.observer/?keyword=CVE-2026-73524&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=cypht&match=exact; metadata:signature_type network_only; sid:1079208; rev:1;)
CVE-2026-73524.rules on GitHub
References
Vendor advisories and patches
- Release Notes (release-notes)
- Patch Commit (patch)
Exploits and technical analysis
- Pull Request (issue-tracking)
- https://www.vulncheck.com/advisories/cypht-xss-via-from-email-header-in-contacts-module (third-party-advisory)
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.