{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/webex-services/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":9.8,"id":"CVE-2026-20184"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Webex Services"],"_cs_severities":["critical"],"_cs_tags":["cve-2026-20184","webex","sso","impersonation","authentication"],"_cs_type":"advisory","_cs_vendors":["Cisco"],"content_html":"\u003cp\u003eCVE-2026-20184 is a critical vulnerability affecting the single sign-on (SSO) integration with Control Hub in Cisco Webex Services. This flaw stems from improper certificate validation during the SSO process. An unauthenticated, remote attacker can exploit this vulnerability by crafting a malicious token and presenting it to a vulnerable service endpoint. Successful exploitation enables the attacker to impersonate any user within the Webex Services environment. This could lead to significant data breaches, unauthorized access to sensitive communications, and disruption of Webex services for legitimate users. The vulnerability was reported and patched in April 2026.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies a Cisco Webex Services deployment utilizing SSO with Control Hub.\u003c/li\u003e\n\u003cli\u003eThe attacker analyzes the SSO implementation to identify the certificate validation process.\u003c/li\u003e\n\u003cli\u003eThe attacker discovers the improper certificate validation vulnerability (CVE-2026-20184) within the Webex Services environment.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious SSO token, bypassing the flawed certificate validation.\u003c/li\u003e\n\u003cli\u003eThe attacker connects to a Webex service endpoint and presents the crafted token.\u003c/li\u003e\n\u003cli\u003eDue to the improper validation, the Webex service accepts the forged token.\u003c/li\u003e\n\u003cli\u003eThe attacker successfully authenticates as the targeted user without proper credentials.\u003c/li\u003e\n\u003cli\u003eThe attacker gains unauthorized access to Webex services, potentially exfiltrating sensitive data or disrupting services.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-20184 allows an unauthenticated attacker to impersonate any user within a Cisco Webex Services organization. This can lead to complete account takeover, unauthorized access to sensitive meetings and communications, and the potential for widespread data breaches. The severity is critical due to the ease of exploitation and the high impact on confidentiality, integrity, and availability of Webex services. Depending on the compromised user's permissions, the attacker could also modify organizational settings or disrupt the entire Webex infrastructure.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eReview Webserver logs for suspicious POST requests with unusual tokens targeting SSO endpoints to detect potential exploitation attempts (see rule \u0026quot;Detect Suspicious Webex SSO Token\u0026quot;).\u003c/li\u003e\n\u003cli\u003eMonitor Webex service logs for successful authentication events immediately following unusual POST requests with tokens to SSO endpoints (see rule \u0026quot;Detect Webex SSO Impersonation\u0026quot;).\u003c/li\u003e\n\u003cli\u003eOrganizations using Cisco Webex Services should ensure they have applied the patch released to address CVE-2026-20184.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-05-16T12:00:00Z","date_published":"2024-05-16T12:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-05-cisco-webex-sso-bypass/","summary":"CVE-2026-20184 allows an unauthenticated, remote attacker to impersonate any user in Cisco Webex Services by exploiting improper certificate validation in single sign-on (SSO) integration with Control Hub, potentially granting unauthorized access.","title":"Cisco Webex Services SSO Impersonation Vulnerability (CVE-2026-20184)","url":"https://feed.craftedsignal.io/briefs/2024-05-cisco-webex-sso-bypass/"}],"language":"en","title":"CraftedSignal Threat Feed - Webex Services","version":"https://jsonfeed.org/version/1.1"}