CVE-2020-11737

Name: CVE-2020-11737
Creator: NVD / NIST
Published: 2020-05-05T15:15:12.28+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.72%

Last modified Jun 17, 2026

CVE-2020-11737 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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. EPSS estimates a 1.72% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

1.72%

74.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Zimbra	Zimbra	9.0.0

References

https://blog.zimbra.com/2020/05/new-zimbra-9-kepler-patch-2/Vendor Advisory
https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P2Vendor Advisory
https://wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesVendor Advisory
https://blog.zimbra.com/2020/05/new-zimbra-9-kepler-patch-2/Vendor Advisory
https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P2Vendor Advisory
https://wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesVendor Advisory

Timeline

Published: May 5, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-11737?

How severe is CVE-2020-11737?

CVE-2020-11737 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.72% probability of exploitation in the next 30 days.

How do I fix CVE-2020-11737?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-11737?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST