{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/lettabot-0.2.0/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":7.3,"id":"CVE-2026-18990"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["LettaBot (0.2.0)"],"_cs_severities":["high"],"_cs_tags":["web-application","authentication-bypass","cve-2026-18990"],"_cs_type":"advisory","_cs_vendors":["letta-ai"],"content_html":"\u003cp\u003eA security vulnerability (CVE-2026-18990) has been identified in LettaBot version 0.2.0. The flaw resides within the API Status Route, specifically implemented in the file 'src/api/server.ts'. Due to missing authentication checks, remote attackers can interact with this API endpoint without providing valid credentials. This vulnerability is particularly concerning as a public proof-of-concept exploit exists, and the vendor has remained unresponsive to disclosure attempts. Organizations utilizing this specific version of LettaBot are at risk of unauthorized API interaction, potentially leading to information disclosure or further exploitation depending on the capabilities exposed by the status route.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker performs network reconnaissance to identify internet-facing LettaBot deployments.\u003c/li\u003e\n\u003cli\u003eAttacker probes the API Status Route endpoint (typically associated with src/api/server.ts).\u003c/li\u003e\n\u003cli\u003eAttacker sends a crafted HTTP request to the vulnerable API endpoint.\u003c/li\u003e\n\u003cli\u003eThe application fails to validate the requester's identity due to missing authentication logic.\u003c/li\u003e\n\u003cli\u003eThe API processes the request and returns status information or executes exposed functions.\u003c/li\u003e\n\u003cli\u003eAttacker leverages the unauthenticated access to exfiltrate system metadata or state information.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation allows remote attackers to bypass authentication requirements, potentially leading to unauthorized visibility into the operational status of the LettaBot service. While the full scope of exposed status data depends on the specific deployment, the vulnerability grants attackers an entry point into the application's API layer.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cp\u003ePrioritized, concrete actions for detection engineering and security teams:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003eAudit all internet-facing instances of LettaBot to determine if they are running version 0.2.0.\u003c/li\u003e\n\u003cli\u003eImplement access control lists (ACLs) or network-level restrictions (e.g., VPN, firewall) to limit access to the API Status Route to trusted internal IP ranges.\u003c/li\u003e\n\u003cli\u003eDeploy web application firewall (WAF) signatures to detect and block abnormal or unauthenticated requests to the API Status Route endpoint.\u003c/li\u003e\n\u003cli\u003eMonitor web server logs for high volumes of requests to API endpoints originating from unauthorized sources.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-08-06T03:21:34Z","date_published":"2026-08-06T03:21:34Z","id":"https://feed.craftedsignal.io/briefs/2026-08-lettabot-auth-bypass/","summary":"LettaBot version 0.2.0 contains a missing authentication vulnerability in its API Status Route, enabling remote unauthenticated access to system functions.","title":"Authentication Bypass Vulnerability in LettaBot API","url":"https://feed.craftedsignal.io/briefs/2026-08-lettabot-auth-bypass/"}],"language":"en","title":"CraftedSignal Threat Feed - LettaBot (0.2.0)","version":"https://jsonfeed.org/version/1.1"}