{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","favicon":"https://feed.craftedsignal.io/favicon-32x32.png","feed_url":"https://feed.craftedsignal.io/products/stoatchat--0.15.5/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":["cpe:2.3:a:stoatchat:stoatchat:*:*:*:*:*:*:*:*"],"_cs_cves":[{"cvss":8.8,"id":"CVE-2026-100679"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["stoatchat (\u003c 0.15.5)"],"_cs_severities":["high"],"_cs_tags":["authentication-bypass","mfa-bypass","cve-2026-100679"],"_cs_type":"advisory","_cs_vendors":["stoatchat"],"content_html":"\u003cp\u003eCVE-2026-100679 identifies a critical authentication vulnerability in the stoatchat application (versions prior to 0.15.5). The vulnerability stems from an improper validation of Multi-Factor Authentication (MFA) tickets during the session authentication process. Specifically, the application fails to verify that a provided MFA ticket is cryptographically or logically bound to the session token of the user currently attempting to authenticate.\u003c/p\u003e\n\u003cp\u003eAn unauthenticated or authenticated attacker can exploit this flaw by obtaining a valid MFA ticket from their own legitimate account and subsequently injecting it into an HTTP request alongside a compromised or targeted user's session token. If successful, the server accepts the attacker-provided ticket as valid for the victim's session, effectively bypassing the TOTP or MFA challenge. This allows the attacker to gain unauthorized access to sensitive account settings, view recovery codes, or disable MFA entirely without knowledge of the victim's second-factor device. Defenders should prioritize upgrading to version 0.15.5 or later to enforce proper MFA session binding.\u003c/p\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eThe vulnerability allows for the complete bypass of MFA protections within the stoatchat platform. If exploited, attackers can gain unauthorized access to victim accounts, leading to sensitive data exposure, potential account takeover, and the permanent removal of secondary security controls. This presents a high risk to all users and organizations relying on stoatchat for secure communication or data management.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eUpgrade all stoatchat instances to version 0.15.5 or later immediately to patch CVE-2026-100679.\u003c/li\u003e\n\u003cli\u003eAudit application logs for abnormal MFA authentication patterns, specifically multiple successful MFA validations originating from different session identifiers within short timeframes.\u003c/li\u003e\n\u003cli\u003eForce session invalidation for all active users following the deployment of the security patch.\u003c/li\u003e\n\u003c/ol\u003e\n","date_modified":"2026-09-26T17:00:40Z","date_published":"2026-09-26T17:00:40Z","id":"https://feed.craftedsignal.io/briefs/2026-09-stoatchat-mfa-bypass/","summary":"stoatchat versions prior to 0.15.5 are vulnerable to an authentication bypass where attackers can use their own MFA ticket to authenticate against a victim's session.","title":"Authentication Bypass in stoatchat via MFA Ticket Manipulation","url":"https://feed.craftedsignal.io/briefs/2026-09-stoatchat-mfa-bypass/"}],"language":"en","title":"CraftedSignal Threat Feed - Stoatchat (\u003c 0.15.5)","version":"https://jsonfeed.org/version/1.1"}