RCE in Websystems Webtotum
CVE-2026-6743
A vulnerability has been found in WebSystems WebTOTUM 2026. This impacts an unknown function of the component Calendar. The manipulation leads to cross site scripting. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. Upgrading the affected component is recommended. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (23.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Websystems Webtotum — versions 2026
Weakness classification (CWE)
References
- vuldb.com/vuln/358434 (vdb-entry)
- vuldb.com/vuln/358434/cti (signature, permissions-required)
- vuldb.com/submit/794617 (third-party-advisory)
- olografix.org/acme/WebTOTUM-POC.gif (exploit)
- www.websys.eu/gestionale-online-in-cloud-per-pmi-callcenter (patch)
Frequently asked questions
- What is CVE-2026-6743?
- CVE-2026-6743 is a low-severity vulnerability in Websystems Webtotum, classified under Cross-site Scripting. CVSS score: 3.5/10. Published 2026-04-21.
- How severe is CVE-2026-6743?
- Low severity. CVSS v3 base score is 3.5 out of 10.