CVE-2018-6882 Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS)

Exploited in the wild Medium 6.1 Published 27 Mar 2018 Updated 1 Oct 2026

Remote attackers can inject arbitrary web script or HTML via a Content-Location header in email attachments, potentially compromising user sessions.

Exploited in the wild: Since 19 Apr 2022
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2018-6882?

CVE-2018-6882 is a medium-severity cross-site scripting vulnerability in Synacor Zimbra Collaboration Suite, published on 27 Mar 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-79

Which versions are affected by CVE-2018-6882?

It affects 1 product.

Products include Synacor Zimbra Collaboration Suite.

How do I fix CVE-2018-6882?

No fix has been published for CVE-2018-6882 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 10 May 2022.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2018-6882 being exploited?

Yes. Attackers have exploited CVE-2018-6882 in the wild since at least 19 Apr 2022, including in ransomware campaigns.

Public exploit code: 1 Nuclei template.

All Synacor Zimbra Collaboration Suite vulnerabilities

Sources

Also known as GHSA-3rrv-gxmq-5643.