What’s Vulnerable › Vulnerabilities

CVE-2026-56835: PraisonAI Slack app_mention bypasses configured user/channel authorization

• Severity: high (CVSS 8.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-23 · updated 2026-10-29
• Weakness: CWE-862

Description

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.

Affected products

• MervinPraison PraisonAI: from 3.11.0, < 4.6.59

References

• https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-qvpf-j64c-jmhr
• https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-qvpf-j64c-jmhr

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