{"id":"CVE-2018-6882","kind":"vulnerability","aliases":["CVE-2018-6882"],"related":[],"title":"Synacor Zimbra Collaboration Suite (ZCS): Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability","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.","summary":"Zimbra Collaboration Suite has a cross-site scripting flaw that lets a remote attacker inject arbitrary web script or HTML. CISA lists it as actively exploited, and the tags mark it as used in ransomware campaigns.","severity":"high","cvss":6.1,"epss":0.29761,"exploited":true,"exploited_at":"2022-04-19T00:00:00+00:00","products":[{"name":"Synacor Zimbra Collaboration Suite (ZCS)","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["email","exploited","package","ransomware","self-hosted","zimbra"],"not_affected_if":["managed-hosting"],"how_to_check":null,"fix":"Apply the Zimbra updates per vendor instructions; the sources do not give a fixed version.","status":"open","published_at":"2018-03-27T16:29:00+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:17:45+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-23T21:17:45Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Zimbra updates per vendor instructions; the sources do not give a fixed version.","reach":"internet","impact":"medium","summary":"Zimbra Collaboration Suite has a cross-site scripting flaw that lets a remote attacker inject arbitrary web script or HTML. CISA lists it as actively exploited, and the tags mark it as used in ransomware campaigns.","category":"package","who_cares":["zimbra","self-hosted","email"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Attacker runs scripts in users' mail sessions and steals data.","analyst_note":"Find the fixed Zimbra version and affected range from the Synacor advisory or the CISA KEV entry; the sources do not give either.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["managed-hosting"],"user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000459,"input_tokens":2896,"output_tokens":339,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2018':18A,21A '-6882':19A,22A '1':91C '8.7':89C '8.8':93C '8.8.7':96C 'activ':61B 'allow':98C 'arbitrari':52B,103C 'attach':117C 'attack':50B,100C 'campaign':72B 'cisa':57B 'collabor':3A,8A,37B,85C 'collaboration':25A 'content':111C 'content-loc':110C 'cross':12A,42B,74C 'cross-sit':11A,41B,73C 'cve':17A,20A 'email':28B,116C 'exploit':29B,62B 'flaw':45B 'function':82C 'header':113C 'host':34B 'html':56B,107C 'inject':51B,102C 'let':47B 'list':58B 'locat':112C 'mark':66B 'might':97C 'packag':30B 'patch':90C 'ransomwar':31B,71B 'remot':49B,99C 'script':14A,44B,54B,76C,105C 'self':33B 'self-host':32B 'site':13A,43B,75C 'suit':4A,9A,38B,86C 'suite':26A 'synacor':1A,6A,23A 'tag':65B 'use':69B 'via':108C 'vulner':16A,78C 'web':53B,104C 'x':94C 'xss':15A,77C 'zcs':5A,10A,27A,87C 'zimbra':2A,7A,24A,35B,36B,84C 'zmmailmsgview.getattachmentlinkhtml':81C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2018-03-27T16:29:00+00:00","kev":{"dateAdded":"2022-04-19","dueDate":"2022-05-10","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Known"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2018-6882","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-6882","severity":null,"published_at":"2022-04-19T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:52+00:00","fetched_at":"2026-10-25T14:39:40+00:00","note":null},{"source":"epss","external_id":"CVE-2018-6882","url":"https://api.first.org/data/v1/epss?cve=CVE-2018-6882","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:45+00:00","fetched_at":"2026-10-23T19:13:45+00:00","note":null},{"source":"nvd","external_id":"CVE-2018-6882","url":"https://nvd.nist.gov/vuln/detail/CVE-2018-6882","severity":null,"published_at":"2018-03-27T16:29:00+00:00","modified_at":"2026-10-01T20:17:17+00:00","first_seen_at":"2026-10-23T21:57:35+00:00","fetched_at":"2026-10-23T21:57:35+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}