CVE-2021-35208

moderate-risk
Published 2021-07-02

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.

Do I need to act?

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0.74% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.4/10 Medium
NETWORK / LOW complexity

Affected Products (20)

Affected Vendors

Zimbra

References (10)

Exploit https://blog.sonarsource.com/zimbra-webmail-compromise-via-email
Release Notes https://wiki.zimbra.com/wiki/Security_Center
Release Notes https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P23
Release Notes https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P16
Vendor Advisory https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
Exploit https://blog.sonarsource.com/zimbra-webmail-compromise-via-email
Release Notes https://wiki.zimbra.com/wiki/Security_Center
Release Notes https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P23
Release Notes https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P16
Vendor Advisory https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
44
/ 100
moderate-risk
Severity 21/34 · High
Exploitability 2/34 · Minimal
Exposure 21/34 · High