CVE-2018-6882
MediumExploitedPublic exploitCross-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…
Published Mar 27, 2018 · Updated Oct 3, 2026
Key Facts
Patch immediately- CVE-2018-6882 is a medium-severity vulnerability (CVSS 6.1 v3.1) affecting Zimbra Collaboration Suite (Synacor).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 14, 2022 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 30% probability of exploitation in the next 30 days.
- Fixed versions are available, including Zimbra Collaboration Suite 8.7.0.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS (30-day exploit likelihood)
30%
Higher than 98.1% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Apr 19, 2022 | May 10, 2022 | Known |
| Industry KEV feed | Apr 14, 2022 | May 10, 2022 | Known |
| CIRCL KEV | Apr 19, 2022 | May 10, 2022 | Known |
| ENISA EUVD | Apr 19, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
9 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Zimbra Collaboration SuiteSynacor | 8.7.0, 8.8.0, 8.8.1, 8.8.2, 8.8.3, 8.8.4, 8.8.5, 8.8.6 | 8.7.0 |
Patched Releases
Zimbra Collaboration Suite
8.7.0
Timeline
Publicly disclosed
Mar 27, 2018
Added to Industry KEV feed
Apr 14, 2022
Added to CISA KEV
Apr 19, 2022
Added to CIRCL KEV
Apr 19, 2022
Added to ENISA EUVD
Apr 19, 2022
Last updated
Oct 3, 2026
Weakness Type
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
References
- advisory20180324 Cross-Site Scripting vulnerability in Zimbra Collaboration Suite due to the way it handles attachment links
- advisoryhttps://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
- advisory20180324 Cross-Site Scripting vulnerability in Zimbra Collaboration Suite due to the way it handles attachment links
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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.
Affected: Zimbra Collaboration Suite (Synacor) versions 8.7.0, 8.8.0, 8.8.1, 8.8.2, 8.8.3, 8.8.4, 8.8.5, 8.8.6. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 14, 2022 and is known to be used in ransomware campaigns.
Yes. It was added on Apr 19, 2022 with a federal remediation due date of May 10, 2022.
Public exploit code is available.
Fixed versions are available, including Zimbra Collaboration Suite 8.7.0.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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