CVE-2021-35208

Public Exploit

Description

An issue was discovered in ZmMailMsgView.js in the Calendar Invite component in Zimbra Collaboration Suite 8.8.x before 8.8.15 Patch 23. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.

Category

5.4
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.89% Top 30%
Vendor Advisory zimbra.com Vendor Advisory zimbra.com Vendor Advisory zimbra.com Vendor Advisory zimbra.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories vendor advisory
https://wiki.zimbra.com/wiki/Security_Center release notes vendor advisory
https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P16 release notes vendor advisory
https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P23 release notes vendor advisory
https://blog.sonarsource.com/zimbra-webmail-compromise-via-email exploit third party advisory mitigation

Frequently Asked Questions

What is the severity of CVE-2021-35208?
CVE-2021-35208 has been scored as a medium severity vulnerability.
How to fix CVE-2021-35208?
To fix CVE-2021-35208, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-35208 being actively exploited in the wild?
It is possible that CVE-2021-35208 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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