CVE-2018-6882

Name: CVE-2018-6882
Creator: NVD / NIST
Published: 2018-03-27T16:29:00.53+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10Actively ExploitedEPSS 23.72%

Last modified Jun 17, 2026

CVE-2018-6882 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Cross-site scripting (XSS) vulnerability in the ZmMailMsgView.getAttachmentLinkHtml function in Zimbra Collaboration Suite (ZCS) before 8.7 Patch 1 and 8.8.x before 8.8.7 might allow remote attackers to inject arbitrary web script or HTML via a Content-Location header in an email attachment.. CISA has confirmed active exploitation in the wild. EPSS estimates a 23.72% chance of exploitation in the next 30 days.

Description

Cross-site scripting (XSS) vulnerability in the ZmMailMsgView.getAttachmentLinkHtml function in Zimbra Collaboration Suite (ZCS) before 8.7 Patch 1 and 8.8.x before 8.8.7 might allow remote attackers to inject arbitrary web script or HTML via a Content-Location header in an email attachment.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

23.72%

97.5th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by May 10, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Synacor	Zimbra Collaboration Suite	< 8.7.0
Synacor	Zimbra Collaboration Suite	8.7.0
Synacor	Zimbra Collaboration Suite	8.8.0
Synacor	Zimbra Collaboration Suite	8.8.1
Synacor	Zimbra Collaboration Suite	8.8.2
Synacor	Zimbra Collaboration Suite	8.8.3
Synacor	Zimbra Collaboration Suite	8.8.4
Synacor	Zimbra Collaboration Suite	8.8.5
Synacor	Zimbra Collaboration Suite	8.8.6

References

http://seclists.org/fulldisclosure/2018/Mar/52Mailing List, Third Party Advisory
http://www.securityfocus.com/archive/1/541891/100/0/threadedBroken Link, Third Party Advisory, VDB Entry
https://bugzilla.zimbra.com/show_bug.cgi?id=108786Broken Link, Issue Tracking, Permissions Required
https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.7Permissions Required
https://wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesVendor Advisory
https://www.securify.nl/advisory/SFY20180101/cross-site-scripting-vulnerability-in-zimbra-collaboration-suite-due-to-the-way-it-handles-attachment-links.htmlExploit, Third Party Advisory
http://seclists.org/fulldisclosure/2018/Mar/52Mailing List, Third Party Advisory
http://www.securityfocus.com/archive/1/541891/100/0/threadedBroken Link, Third Party Advisory, VDB Entry
https://bugzilla.zimbra.com/show_bug.cgi?id=108786Broken Link, Issue Tracking, Permissions Required
https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.7Permissions Required
https://wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesVendor Advisory
https://www.securify.nl/advisory/SFY20180101/cross-site-scripting-vulnerability-in-zimbra-collaboration-suite-due-to-the-way-it-handles-attachment-links.htmlExploit, Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-6882US Government Resource

Timeline

Published: Mar 27, 2018
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2018-6882?

How severe is CVE-2018-6882?

CVE-2018-6882 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 23.72% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2018-6882?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-6882?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST