{"id":"CVE-2018-6882","published":"2018-03-27T16:29:00Z","modified":"2026-10-01T20:17:17Z","title":"Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability","vendor":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","tier":"core","eol":null,"description":{"text":"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.","provenance":"source","from":"NVD"},"summary":{"text":"The flaw is a cross-site scripting (XSS) vulnerability in the ZmMailMsgView.getAttachmentLinkHtml function of Synacor's Zimbra Collaboration Suite (ZCS). A remote attacker who sends a crafted email attachment containing a Content-Location header can inject arbitrary web script or HTML, and this requires no authentication but does require a user to interact with the malicious content.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T08:31:12Z"},"cvss":{"score":6.1,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","provenance":"source","from":"NVD"},"epss":{"score":0.29761,"percentile":0.98192,"date":"2026-10-28","provenance":"source"},"kev":{"dateAdded":"2022-04-19","dueDate":"2022-05-10","ransomware":true,"requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2018-6882","provenance":"source"},"vulncheckKev":{"dateAdded":"2022-04-14","exploitedFirstSeen":"2022-04-14","ransomware":true,"evidence":[{"url":"https://cert.gov.ua/article/39606","date":"2022-04-14"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2022-04-19"}],"evidenceTotal":2,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"references":[{"url":"http://seclists.org/fulldisclosure/2018/Mar/52","tags":["Mailing List","Third Party Advisory"]},{"url":"http://www.securityfocus.com/archive/1/541891/100/0/threaded","tags":["Broken Link","Third Party Advisory","VDB Entry"]},{"url":"https://bugzilla.zimbra.com/show_bug.cgi?id=108786","tags":["Broken Link","Issue Tracking","Permissions Required"]},{"url":"https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.7","tags":["Permissions Required"]},{"url":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories","tags":["Vendor Advisory"]},{"url":"https://www.securify.nl/advisory/SFY20180101/cross-site-scripting-vulnerability-in-zimbra-collaboration-suite-due-to-the-way-it-handles-attachment-links.html","tags":["Exploit","Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2018/Mar/52","tags":["Mailing List","Third Party Advisory"]},{"url":"http://www.securityfocus.com/archive/1/541891/100/0/threaded","tags":["Broken Link","Third Party Advisory","VDB Entry"]},{"url":"https://bugzilla.zimbra.com/show_bug.cgi?id=108786","tags":["Broken Link","Issue Tracking","Permissions Required"]},{"url":"https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.7","tags":["Permissions Required"]},{"url":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories","tags":["Vendor Advisory"]},{"url":"https://www.securify.nl/advisory/SFY20180101/cross-site-scripting-vulnerability-in-zimbra-collaboration-suite-due-to-the-way-it-handles-attachment-links.html","tags":["Exploit","Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-6882","tags":["US Government Resource"]}],"techniques":[{"id":"T1566.002","name":"Spearphishing Link","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: malicious email attachment delivers the script","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"inject arbitrary web script or HTML via a Content-Location header in an email attachment","start":203,"end":291}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: arbitrary script execution in victim browser","mappingType":"primary_impact","evidence":[{"from":"description","quote":"inject arbitrary web script or HTML via a Content-Location header","start":203,"end":268}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2018-18627","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2018-18627","exploited":true,"exploitedSince":"2022-04-19","provenance":"source"},"exploits":[],"exploitSources":{"nuclei":[{"id":"CVE-2018-6882","name":"Zimbra Collaboration Suite - Cross-site Scripting","severity":"medium","path":"http/cves/2018/CVE-2018-6882.yaml","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2018/CVE-2018-6882.yaml"}],"provenance":"source"},"exploitRefs":["https://www.securify.nl/advisory/SFY20180101/cross-site-scripting-vulnerability-in-zimbra-collaboration-suite-due-to-the-way-it-handles-attachment-links.html"],"flow":[{"stage":"exploitation","techniques":["T1566.002"],"provenance":"ai"},{"stage":"primary","techniques":["T1059"],"provenance":"ai"}],"timeline":[{"date":"2018-03-27","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2018-6882","provenance":"source"},{"date":"2022-04-14","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://cert.gov.ua/article/39606","provenance":"source"},{"date":"2022-04-19","kind":"kev","label":"Added to CISA KEV (known ransomware use)","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2022-04-19","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2018-18627","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":1484},"priority":{"score":76.9,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 1659 days ago"},{"name":"Known ransomware use","points":10.0,"detail":"CISA KEV and VulnCheck KEV: Known"},{"name":"EPSS percentile","points":19.64,"detail":"percentile 0.9819"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 NVD reference tagged Exploit; 1 nuclei template"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":4.27,"detail":"base score 6.1"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-class-synacor-zimbra-collaboration-suite-zcs-cwe-79"}}