What’s Vulnerable › Vulnerabilities

CVE-2018-18631

• Severity: medium (CVSS 6.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-05-29 · updated 2026-06-17
• Weakness: CWE-79

Description

mailboxd component in Synacor Zimbra Collaboration Suite 8.6, 8.7 before 8.7.11 Patch 7, and 8.8 before 8.8.10 Patch 2 has Persistent XSS.

Affected products

• Zimbra Collaboration: from 8.7.0 before 8.7.11; from 8.8.0 before 8.8.9; 8.6.0, 8.7.11, 8.7.11-p1, 8.7.11-p2, 8.7.11-p3, 8.7.11-p4 (+9) — fixed in 8.7.11, 8.8.9

How to fix

Upgrade to a fixed version: Zimbra Collaboration 8.7.11, 8.8.9. Check the vendor advisory for mitigations.

References

• https://bugzilla.zimbra.com/show_bug.cgi?id=109020
• https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
• https://bugzilla.zimbra.com/show_bug.cgi?id=109020
• https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories

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