CVE-2026-6743 WebSystems WebTOTUM Calendar cross site scripting
Remote attackers can inject malicious scripts into the WebTOTUM Calendar component, potentially compromising user sessions or executing code.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-6743?
CVE-2026-6743 is a medium-severity cross-site scripting vulnerability in WebSystems WebTOTUM, published on 21 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
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.
Which versions are affected by CVE-2026-6743?
How do I fix CVE-2026-6743?
No fix has been published for CVE-2026-6743 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-6743 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6743 exists.
Sources
Also known as GHSA-3m63-v2w7-cxcr.