CVE-2018-6882

Status: AnalyzedMedium (6.1)⚠ Active exploitation

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.

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Base score: 6.1

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 30%
Percentile among all scored CVEs: 98
Score date: 10/6/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

CISA KEV — actively exploited

Added to catalog: 4/19/2022
Remediation due date: 5/10/2022
Known ransomware use: Known

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1189 Drive-by Compromiseinitial access85 %
Primary impactT1059.007 JavaScriptexecution65 %

XSS en header Content-Location de adjunto permite inyectar script ejecutable en contexto web del cliente (T1189 drive-by). Afecta UI:R, requiere interacción. Ransomware activo sugiere ejecución de comandos post-explotación y distribución via email malicioso.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Restrict Web-Based Content User Training Execution Prevention Behavior Prevention on Endpoint Disable or Remove Feature or Program Application Isolation and Sandboxing

Affected technologies (1)

Synacor — Zimbra Collaboration Suite

CWEs

CWE-79
CWE-79

References

Raw JSON (NVD)

Show

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