CVE-2020-11737 Cross-site scripting in Zimbra

Medium 6.1 Published 5 May 2020 Updated 4 Aug 2024

Remote attackers can execute arbitrary JavaScript in Zimbra Web Client via crafted email links, requiring user interaction.

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-2020-11737?

CVE-2020-11737 is a medium-severity cross-site scripting vulnerability in n/a, published on 5 May 2020. 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

A cross-site scripting (XSS) vulnerability in Web Client in Zimbra 9.0 allows a remote attacker to craft links in an E-Mail message or calendar invite to execute arbitrary JavaScript. The attack requires an A element containing an href attribute with a "www" substring (including the quotes) followed immediately by a DOM event listener such as onmouseover. This is fixed in 9.0.0 Patch 2.

Weakness: CWE-79

Which versions are affected by CVE-2020-11737?

It affects 1 product.

Products include Zimbra Zimbra.

How do I fix CVE-2020-11737?

No fix has been published for CVE-2020-11737 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-2020-11737 being exploited?

There is no known exploitation of CVE-2020-11737 in the wild and no public exploit code.

Sources

Also known as GHSA-v5c5-9fh5-f3wx.