{"id":"CVE-2023-37580","kind":"vulnerability","aliases":["CVE-2023-37580"],"related":[],"title":"synacor zimbra collaboration suite: Zimbra Collaboration (ZCS) 8 before 8.8.15 Patch 41 allows XSS in the Zimbra Classic Web Client","description":"Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability impacting the confidentiality and integrity of data.\n\nCISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","summary":"Synacor Zimbra Collaboration Suite (ZCS) has a cross-site scripting flaw that can affect the confidentiality and integrity of data. CISA lists it as exploited in the wild, so attackers are already using it.","severity":"high","cvss":6.1,"epss":null,"exploited":true,"exploited_at":"2023-07-27T00:00:00+00:00","products":[{"name":"Synacor Zimbra Collaboration Suite (ZCS)","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"synacor zimbra collaboration suite","fixed":["8.8.15"],"affected":">= 8.8.0, < 8.8.15","ecosystem":"vendor"},{"name":"synacor zimbra collaboration suite","fixed":[],"affected":"= 8.8.15","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["email","exploited","package","self-hosted","zimbra"],"not_affected_if":["managed-hosting"],"how_to_check":null,"fix":"Apply the mitigations per vendor instructions, or discontinue use of the product if mitigations are unavailable (per CISA required action).","status":"open","published_at":"2023-07-27T00:00:00+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T21:04:52+00:00","updated_at":"2026-10-23T22:29:04+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-23T21:04:52Z","model":"claude-haiku-5-5","output":{"fix":"Apply the mitigations per vendor instructions, or discontinue use of the product if mitigations are unavailable (per CISA required action).","reach":"internet","impact":"medium","summary":"Synacor Zimbra Collaboration Suite (ZCS) has a cross-site scripting flaw that can affect the confidentiality and integrity of data. CISA lists it as exploited in the wild, so attackers are already using it.","category":"package","who_cares":["zimbra","self-hosted","email"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Attacker runs scripts in users' sessions and reads or alters their mail data.","analyst_note":"Find the vendor advisory and affected/fixed versions for ZCS, and the patch or mitigation steps, via the CISA KEV entry at https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-37580.","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":0.000487,"input_tokens":2864,"output_tokens":402,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2023':22A,25A '-37580':23A,26A '41':12A '8':8A '8.8.15':10A 'action':102C 'affect':61B 'allow':13A 'alreadi':79B 'appli':103C 'attack':77B 'cisa':68B,100C 'classic':18A 'client':20A 'collabor':3A,6A,49B,83C 'collaboration':29A,34A,38A 'confidenti':63B,95C 'contain':86C 'cross':55B,89C 'cross-sit':54B,88C 'cve':21A,24A 'data':67B,99C 'discontinu':109C 'email':40B 'exploit':41B,72B 'flaw':58B 'host':45B 'impact':93C 'instruct':107C 'integr':65B,97C 'list':69B 'mitig':104C,115C 'packag':42B 'patch':11A 'per':105C 'product':113C 'requir':101C 'script':57B,91C 'self':44B 'self-host':43B 'site':56B,90C 'suit':4A,50B,84C 'suite':30A,35A,39A 'synacor':1A,27A,32A,36A,47B,81C 'unavail':117C 'use':80B,110C 'vendor':106C 'vulner':92C 'web':19A 'wild':75B 'xss':14A 'zcs':7A,31A,51B,85C 'zimbra':2A,5A,17A,28A,33A,37A,46B,48B,82C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2023-07-27T00:00:00+00:00","kev":{"dateAdded":"2023-07-27","dueDate":"2023-08-17","requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Unknown"},"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-2023-37580","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-37580","severity":null,"published_at":"2023-07-27T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T11:39:15+00:00","note":null},{"source":"nvd","external_id":"CVE-2023-37580","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-37580","severity":null,"published_at":"2023-07-31T16:15:10+00:00","modified_at":"2026-06-17T06:08:30+00:00","first_seen_at":"2026-10-23T22:29:04+00:00","fetched_at":"2026-10-23T22:29:04+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"}