Auth bypass in Mervinpraison Praisonai
CVE-2026-56835
PraisonAI is a multi-agent teams system. From version 3.11.0 to before version 4.6.59, 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 issue has been patched in version 4.6.59.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Mervinpraison Praisonai — versions >= 3.11.0, < 4.6.59
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-56835?
- CVE-2026-56835 is a high-severity vulnerability in Mervinpraison Praisonai, classified under Missing Authorization. CVSS score: 8.3/10. Published 2026-10-23.
- How severe is CVE-2026-56835?
- High severity. CVSS v3 base score is 8.3 out of 10.