CVE-2026-61436: Improper Authentication in MervinPraison PraisonAI
PraisonAI before 4.6.78 fails to verify Svix webhook signatures in AgentMail webhook mode, allowing unauthenticated attackers to forge message.received events. Attackers can send crafted JSON payloads to the webhook endpoint to invoke configured agents with arbitrary sender addresses and message content.
AI Analysis
Technical Summary
CVE-2026-61436 describes an authentication bypass vulnerability in MervinPraison's PraisonAI product before version 4.6.78. The product fails to verify Svix webhook signatures when operating in AgentMail webhook mode. As a result, attackers can send maliciously crafted JSON payloads to the webhook endpoint, impersonating legitimate webhook events. This allows attackers to trigger configured agents with arbitrary sender addresses and message content without authentication. The vulnerability has a CVSS 4.0 score of 8.8, indicating high severity. No official patch or remediation guidance is currently documented.
Potential Impact
An attacker can forge webhook events to invoke agents with arbitrary sender addresses and message content, potentially leading to unauthorized actions or manipulation of the system's automated processes. This could undermine the integrity of message handling and agent invocation within PraisonAI.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the webhook endpoint to trusted sources where possible and monitor for suspicious webhook activity. Avoid relying solely on webhook events for critical authentication or authorization decisions.
CVE-2026-61436: Improper Authentication in MervinPraison PraisonAI
Description
PraisonAI before 4.6.78 fails to verify Svix webhook signatures in AgentMail webhook mode, allowing unauthenticated attackers to forge message.received events. Attackers can send crafted JSON payloads to the webhook endpoint to invoke configured agents with arbitrary sender addresses and message content.
CVSS v4.0
Score 8.8high
Affected software
pkg:github/mervinpraison/PraisonAIRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-61436 describes an authentication bypass vulnerability in MervinPraison's PraisonAI product before version 4.6.78. The product fails to verify Svix webhook signatures when operating in AgentMail webhook mode. As a result, attackers can send maliciously crafted JSON payloads to the webhook endpoint, impersonating legitimate webhook events. This allows attackers to trigger configured agents with arbitrary sender addresses and message content without authentication. The vulnerability has a CVSS 4.0 score of 8.8, indicating high severity. No official patch or remediation guidance is currently documented.
Potential Impact
An attacker can forge webhook events to invoke agents with arbitrary sender addresses and message content, potentially leading to unauthorized actions or manipulation of the system's automated processes. This could undermine the integrity of message handling and agent invocation within PraisonAI.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the webhook endpoint to trusted sources where possible and monitor for suspicious webhook activity. Avoid relying solely on webhook events for critical authentication or authorization decisions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-07-09T14:05:47.928Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a57771e68715ace43a93b94
Added to database: 07/15/2026, 12:03:42 UTC
Last enriched: 07/15/2026, 12:18:20 UTC
Last updated: 07/16/2026, 03:43:50 UTC
Views: 9
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