{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/vendors/synacor/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":6.1,"id":"CVE-2025-48700"}],"_cs_exploited":false,"_cs_products":["Zimbra Collaboration Suite (ZCS)"],"_cs_severities":["medium"],"_cs_tags":["xss","vulnerability","zimbra"],"_cs_type":"advisory","_cs_vendors":["Synacor"],"content_html":"\u003cp\u003eA cross-site scripting (XSS) vulnerability, identified as CVE-2025-48700, exists within the Synacor Zimbra Collaboration Suite (ZCS). This flaw could be exploited by attackers to inject and execute arbitrary JavaScript code within a user\u0026rsquo;s web browser session when they interact with a compromised Zimbra instance. Successful exploitation could lead to the theft of session cookies, credential harvesting, or other malicious activities performed on behalf of the victim user. The vulnerability requires user interaction to trigger, making it essential to educate users about the risks of clicking on untrusted links or opening suspicious attachments. The scope of the vulnerability affects installations of Zimbra Collaboration Suite.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker identifies a vulnerable Zimbra Collaboration Suite (ZCS) instance.\u003c/li\u003e\n\u003cli\u003eAttacker crafts a malicious URL or injects malicious JavaScript into a ZCS component (e.g., email, calendar, or task).\u003c/li\u003e\n\u003cli\u003eThe attacker delivers the malicious URL or crafted item to a target user, often via phishing or social engineering.\u003c/li\u003e\n\u003cli\u003eThe user clicks on the malicious URL or interacts with the injected content within ZCS.\u003c/li\u003e\n\u003cli\u003eThe user\u0026rsquo;s browser executes the attacker-controlled JavaScript code.\u003c/li\u003e\n\u003cli\u003eThe JavaScript code steals the user\u0026rsquo;s session cookie or performs other malicious actions within the context of the user\u0026rsquo;s session.\u003c/li\u003e\n\u003cli\u003eThe attacker uses the stolen session cookie to hijack the user\u0026rsquo;s session and gain unauthorized access to the Zimbra account.\u003c/li\u003e\n\u003cli\u003eThe attacker accesses sensitive information, sends malicious emails, or performs other unauthorized actions on behalf of the compromised user.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this XSS vulnerability can lead to unauthorized access to sensitive information stored within the Zimbra Collaboration Suite. Attackers could potentially read emails, access contacts, steal credentials, and perform other malicious activities on behalf of the compromised user. This can result in data breaches, financial loss, and reputational damage. The number of potential victims depends on the number of users of the affected Zimbra instance.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply mitigations per vendor instructions to patch CVE-2025-48700 (\u003ca href=\"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories)\"\u003ehttps://wiki.zimbra.com/wiki/Zimbra_Security_Advisories)\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003eFollow applicable BOD 22-01 guidance for cloud services if Zimbra ZCS is deployed in a cloud environment.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u0026ldquo;Detect Suspicious URI Parameters for Potential XSS\u0026rdquo; to identify potentially malicious requests targeting ZCS.\u003c/li\u003e\n\u003cli\u003eEducate users about the risks of clicking on untrusted links and opening suspicious attachments to prevent exploitation of the XSS vulnerability.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-24T12:00:00Z","date_published":"2024-01-24T12:00:00Z","id":"/briefs/2024-01-zimbra-xss/","summary":"A cross-site scripting (XSS) vulnerability in Synacor Zimbra Collaboration Suite (ZCS) could allow attackers to execute arbitrary JavaScript within a user's session, potentially leading to unauthorized access to sensitive information.","title":"Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability","url":"https://feed.craftedsignal.io/briefs/2024-01-zimbra-xss/"}],"language":"en","title":"CraftedSignal Threat Feed — Synacor","version":"https://jsonfeed.org/version/1.1"}