CVE-2017-10840 Cross-site scripting in WebCalendar

Medium 6.1 Published 28 Aug 2017 Updated 5 Aug 2024

An attacker can inject arbitrary web script or HTML into WebCalendar, potentially compromising user sessions or data.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2017-10840?

CVE-2017-10840 is a medium-severity cross-site scripting vulnerability in k5n.us WebCalendar, published on 28 Aug 2017. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Cross-site scripting vulnerability in WebCalendar 1.2.7 and earlier allows an attacker to inject arbitrary web script or HTML via unspecified vectors.

Weakness: CWE-79

Which versions are affected by CVE-2017-10840?

It affects 1 product.

Products include Webcalendar Project Webcalendar.

How do I fix CVE-2017-10840?

No fix has been published for CVE-2017-10840 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-2017-10840 being exploited?

There is no known exploitation of CVE-2017-10840 in the wild and no public exploit code.

Sources

Also known as GHSA-rg28-qhrf-c54c.