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CVE-2018-3763 Cross-site scripting in Nextcloud Calendar application

Medium 4.8 Published Updated

Privileged users can inject malicious scripts into group names, leading to stored XSS attacks against other users in Nextcloud Calendar.

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

What is CVE-2018-3763?

CVE-2018-3763 is a medium-severity cross-site scripting vulnerability in Nextcloud Calendar application, published on 5 Jul 2018. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

Official description

In Nextcloud Calendar before 1.5.8 and 1.6.1, a missing sanitization of search results for an autocomplete field could lead to a stored XSS requiring user-interaction. The missing sanitization only affected group names, hence malicious search results could only be crafted by privileged users like admins or group admins.

Weakness: CWE-79

Which versions are affected by CVE-2018-3763?

It affects 1 product.

Products include Nextcloud Calendar.

How do I fix CVE-2018-3763?

No fix has been published for CVE-2018-3763 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-2018-3763 being exploited?

There is no known exploitation of CVE-2018-3763 in the wild and no public exploit code.

Sources

Also known as GHSA-5pqm-hfmj-g8jg.

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