CVE-2026-56837

The record

PraisonAI is a multi-agent teams system. From version 4.6.56 to before version 4.6.59, PraisonAI's LinearBot starts a public webhook listener on 0.0.0.0 and treats LINEAR_WEBHOOK_SECRET as optional. When the secret is absent, startup only logs a warning and _handle_webhook() skips Linear-Signature verification entirely. An unauthenticated network caller who can reach the webhook endpoint can submit a forged Linear-Event: AgentSession request. The forged request is parsed, scheduled for background processing, dispatched to _handle_agent_session(), and passed into BotSessionManager.chat(). The bot then attempts to post the agent response back to Linear under the configured bot token. The PoV is offline and deterministic. It does not contact Linear. It calls the webhook handler directly, monkey-patches the outbound Linear comment path, and proves both sides of the boundary. This issue has been patched in version 4.6.59.

Affected packages

Related vulnerabilities

• CVE-2026-63398 Coop is an open source review and moderation tool from ROOST. CWE-287
• CVE-2026-116239 In server mode pgAdmin 4 keeps an account per authentication source, so the same username… CWE-287
• CVE-2026-62264 PDF Reader MCP is a Model Context Protocol server for reading PDF documents. CWE-287
• CVE-2026-61739 SOCFortress CoPilot focuses on providing a single pane of glass for all your security… CWE-287
• CVE-2026-110799 Vvveb is a powerful and easy to use CMS with page builder to build websites, blogs or… CWE-287
• CVE-2026-119572 Traefik from 3.7.0-ea.1 before 3.7.15 contains an authentication bypass vulnerability in… CWE-287
• CVE-2026-118194 The Page and Post Restriction plugin for WordPress is vulnerable to Authentication Bypass… CWE-287
• CVE-2026-114443 The Security Plugin, Firewall & Malware Scanner with Auto Removal WordPress plugin before… CWE-287