What is CVE-2017-17703?

CVE-2017-17703 is a medium-severity vulnerability in Synacor Zimbra Collaboration Suite, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-02-04.

How severe is CVE-2017-17703?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Synacor Zimbra Collaboration Suite

CVE-2017-17703

Synacor Zimbra Collaboration Suite (ZCS) before 8.8.3 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 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 61st percentile — 61.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Synacor Zimbra Collaboration Suite

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

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

Frequently asked questions

What is CVE-2017-17703?: CVE-2017-17703 is a medium-severity vulnerability in Synacor Zimbra Collaboration Suite, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-02-04.
How severe is CVE-2017-17703?: Medium severity. CVSS v3 base score is 6.1 out of 10.