CVE-2026-55528Public exploitNetwork attack vector

Unauthenticated event interception and injection via ignored token

Published Aug 25, 2026 · Updated Aug 25, 2026

Missing authentication in Mervin Praison praisonaiagents before 1.6.58 allows remote attackers to read and inject AgentServer events. AgentServer._create_app registers /events and /publish without middleware or route checks that compare bearer or X-Auth-Token input with ServerConfig.auth_token. The server must be network-reachable with auth_token configured; exploitation enables event-bus eavesdropping and forged broadcasts without reported availability impact.

CVSS severity8.2
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Mervin Praison praisonaiagents before 1.6.58 allows remote attackers to read and inject AgentServer events. AgentServer._create_app registers /events and /publish without middleware or route checks that compare bearer or X-Auth-Token input with ServerConfig.auth_token. The server must be network-reachable with auth_token configured; exploitation enables event-bus eavesdropping and forged broadcasts without reported availability impact.

The record

CVE
CVE-2026-55528
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
Mervin Praison
Product
PraisonAI
Classifications
CWE-862, CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.6.58

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mervin Praison · PraisonAIversion=< 4.6.58
Mervin Praison · praisonaiagentsversion=< 1.6.58

Published CVSS scores

8.2GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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