What is CVE-2017-8783?

CVE-2017-8783 is a medium-severity vulnerability in Synacor Zimbra Collaboration Suite, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2018-02-04.

How severe is CVE-2017-8783?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Synacor Zimbra Collaboration Suite

CVE-2017-8783

Synacor Zimbra Collaboration Suite (ZCS) before 8.7.10 has Persistent XSS.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-02-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (58.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Synacor Zimbra Collaboration Suite

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

wiki.zimbra.com/wiki/Security_Center (Patch, Vendor Advisory)
bugzilla.zimbra.com/show_bug.cgi (Vendor Advisory, Permissions Required, Issue Tracking)
wiki.zimbra.com/wiki/Zimbra_Security_Advisories (Vendor Advisory)
bugzilla.zimbra.com/show_bug.cgi (Vendor Advisory, Permissions Required, Issue Tracking)

Frequently asked questions

What is CVE-2017-8783?: CVE-2017-8783 is a medium-severity vulnerability in Synacor Zimbra Collaboration Suite, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2018-02-04.
How severe is CVE-2017-8783?: Medium severity. CVSS v3 base score is 5.4 out of 10.