CVE-2026-56835

PraisonAI Slack app_mention bypasses configured user/channel authorization Summary PraisonAI's Slack bot applies its configured allowed_users, allowed_channels, and unknown-user pairing policy in the normal Slack message event handler, but not in the adjacent Slack app_mention event handler. A Slack workspace user who can mention the bot in a channel where the Slack app is present can trigger the configured PraisonAI agent even when: - the sender is not in BotConfig.allowed_users; - the channel is not in BotConfig.allowed_channels; - unknown_user_policy="deny" is configured; and - the same event content is correctly dropped by the normal message handler. This is a sibling-handler guard-coverage issue. Slack documents app_mention as a distinct event type rather than a message.* event, so deployments subscribed to app mentions can route unauthorized sender input around the guarded message path. Affected product - Repository: MervinPraison/PraisonAI - Package: praisonai - Component: src/praisonai/praisonai/bots/slack.py - Configuration component: src/praisonai-agents/praisonaiagents/bots/config.py Confirmed affected: v3.11.0 7f37d754a72511a71f7eeaaa8e9f367a5dc45fd8 v3.11.14 44b800df0eddf32dd5242f47da7513e4a3159d76 v3.12.0 51f95ad904a6616b35caede1cd74026ec8f7152c v4.4.5 9a3363c900fa3be3fce5483be7f6c1f418757ebb v4.4.6 90b00f9a25ee5c7ccf4b6ab3152700e1881f262d v4.4.12 7d0657632fc477673153ad116cecf692b454bfa3 v4.5.2 8ddbb4ee7152d3fa68fbaaf6e6c610ae03d938d3 v4.5.16 02a19776517cc76483fd58dcd6a5fdf8c2c45170 v4.5.28 16f93251766505a79f237a0f07f68a0ecb17e358 v4.5.112 bfe3d94bad6db92fc2927c2e3c081ae8303e209e v4.5.128 b4e3a8a84ade44ac3dd9102b792cdb4311a95937 v4.6.10 4b1b17b963cbd0625e41394a30168c95b26429b2 v4.6.33 dfbb8d78ec7e8dc7118bc722ab1b2524bc98ddab v4.6.34 e5928449f73f66cc8af1de61621aa974ab255133 v4.6.56 d3c4a2afadfbf3a3e172e460e607ba4efad263a6 v4.6.57 e90d92231853161ad931f3498da57651a9f8b528 v4.6.58 1ad58ca02975ff1398efeda694ea2ab78f20cf3e Unaffected boundary contr

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