{"id":"CVE-2025-48700","kind":"vulnerability","aliases":["CVE-2025-48700"],"related":[],"title":"synacor zimbra collaboration suite: An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15 and 9.0 and 10.0 and 10.1","description":"An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15 and 9.0 and 10.0 and 10.1. A Cross-Site Scripting (XSS) vulnerability in the Zimbra Classic UI allows attackers to execute arbitrary JavaScript within the user's session, potentially leading to unauthorized access to sensitive information. This issue arises from insufficient sanitization of HTML content, specifically involving crafted tag structures and attribute values that include an @import directive and other script injection vectors. The vulnerability is triggered when a user views a crafted e-mail message in the Classic UI, requiring no additional user interaction.","summary":"Synacor Zimbra Collaboration Suite has a cross-site scripting flaw that lets attackers run JavaScript inside a logged-in user's session. Attackers can use that to reach sensitive information in the mailbox.","severity":"high","cvss":6.1,"epss":null,"exploited":true,"exploited_at":"2026-04-20T00:00:00+00:00","products":[{"name":"Synacor Zimbra Collaboration Suite (ZCS)","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"synacor zimbra collaboration suite","fixed":["10.0.12"],"affected":">= 10.0.0, < 10.0.12","ecosystem":"vendor"},{"name":"synacor zimbra collaboration suite","fixed":["10.1.4"],"affected":">= 10.1.0, < 10.1.4","ecosystem":"vendor"},{"name":"synacor zimbra collaboration suite","fixed":[],"affected":"= 8.8.15","ecosystem":"vendor"},{"name":"synacor zimbra collaboration suite","fixed":[],"affected":"= 9.0.0","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["email","exploited","package","self-hosted","zimbra"],"not_affected_if":["managed-hosting"],"how_to_check":null,"fix":"Apply the vendor mitigations per CISA guidance (BOD 22-01 applies to cloud services); if mitigations are unavailable, discontinue use of the product. Specific patched versions: unknown","status":"open","published_at":"2025-06-23T15:15:27+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:38:46+00:00","updated_at":"2026-10-23T23:44:51+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-23T20:38:46Z","model":"claude-haiku-5-5","output":{"fix":"Apply the vendor mitigations per CISA guidance (BOD 22-01 applies to cloud services); if mitigations are unavailable, discontinue use of the product. Specific patched versions: unknown","reach":"internet","summary":"Synacor Zimbra Collaboration Suite has a cross-site scripting flaw that lets attackers run JavaScript inside a logged-in user's session. Attackers can use that to reach sensitive information in the mailbox.","category":"package","who_cares":["zimbra","self-hosted","email"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Attacker runs scripts in victim sessions and reads sensitive mailbox data","analyst_note":"Find the Zimbra vendor advisory for CVE-2025-48700 to get affected and fixed versions and the exact mitigation steps; the KEV entry alone does not name them.","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":0.000451,"input_tokens":2605,"output_tokens":381,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2025':21A,24A '-48700':22A,25A '10.0':17A,101C '10.1':19A,103C '8.8.15':13A,97C '9.0':15A,99C 'access':131C 'addit':182C 'allow':116C 'arbitrari':120C 'aris':137C 'attack':67B,78B,117C 'attribut':150C 'classic':114C,178C 'collabor':3A,11A,56B,95C 'collaboration':28A,33A,37A,41A,45A 'content':143C 'craft':146C,171C 'cross':61B,106C 'cross-sit':60B,105C 'cve':20A,23A 'direct':156C 'discov':8A,92C 'e':173C 'e-mail':172C 'email':47B 'execut':119C 'exploit':48B 'flaw':64B 'host':52B 'html':142C 'import':155C 'includ':153C 'inform':85B,134C 'inject':160C 'insid':70B 'insuffici':139C 'interact':184C 'involv':145C 'issu':6A,90C,136C 'javascript':69B,121C 'lead':128C 'let':66B 'log':73B 'logged-in':72B 'mail':174C 'mailbox':88B 'messag':175C 'packag':49B 'potenti':127C 'reach':83B 'requir':180C 'run':68B 'sanit':140C 'script':63B,108C,159C 'self':51B 'self-host':50B 'sensit':84B,133C 'session':77B,126C 'site':62B,107C 'specif':144C 'structur':148C 'suit':4A,57B 'suite':29A,34A,38A,42A,46A 'synacor':1A,26A,31A,35A,39A,43A,54B 'tag':147C 'trigger':165C 'ui':115C,179C 'unauthor':130C 'use':80B 'user':75B,124C,168C,183C 'valu':151C 'vector':161C 'view':169C 'vulner':110C,163C 'within':122C 'xss':109C 'zcs':12A,30A,96C 'zimbra':2A,10A,27A,32A,36A,40A,44A,53B,55B,94C,113C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2025-06-23T15:15:27+00:00","kev":{"dateAdded":"2026-04-20","dueDate":"2026-04-23","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, 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":"134c704f-9b21-4f2e-91b3-4a467353bcc0","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2025-48700","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-48700","severity":null,"published_at":"2026-04-20T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T17:39:55+00:00","note":null},{"source":"nvd","external_id":"CVE-2025-48700","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-48700","severity":null,"published_at":"2025-06-23T15:15:27+00:00","modified_at":"2026-06-17T09:30:11+00:00","first_seen_at":"2026-10-23T23:44:51+00:00","fetched_at":"2026-10-23T23:44:51+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"}