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VulnerabilityPublished

CVE-2026-40289: MervinPraison PraisonAI · Missing Authentication

Affects MervinPraison PraisonAISource CVE Database V5

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Not known to be exploited · CVSS 9.1 Critical : upgrade to 4.5.139 as a priority.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.

Contested

Critical score, yet low EPSS after six months
EPSS
0.4% chance of exploitation in 30 days – higher than 36% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.5.139, 1.5.140
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 14 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade PraisonAI and mervinpraison/PraisonAI to 4.5.139; praisonaiagents to 1.5.140.

Affected software

ProductAffectedFixed in
MervinPraisonPraisonAIAffected
  • <4.5.139
Fixed in
  • 4.5.139
MervinPraisonpraisonaiagentsAffected
  • <1.5.140
Fixed in
  • 1.5.140
GitHubmervinpraison/PraisonAIpkg:github/mervinpraison/PraisonAIOther threatsAffected
  • <4.5.139
Fixed in
  • 4.5.139

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

This vulnerability is fixed in PraisonAI version 4.5.139 and praisonaiagents version 1.5.140. Users should upgrade to these or later versions to remediate the issue. Since the product is not a cloud service, remediation depends on applying these updates. Patch status is not explicitly stated beyond the fixed versions; verify with vendor advisories for the latest guidance.

Description

CVE-2026-40289 is a critical vulnerability in MervinPraison's PraisonAI versions below 4.5.139 and praisonaiagents below 1.5.140. The vulnerability arises from missing authentication on the /ws WebSocket endpoint of the browser bridge component, combined with a bypassable origin check. This allows unauthenticated remote attackers to hijack active browser automation sessions, gaining unauthorized control and access to sensitive data. The issue has been fixed in versions 4.5.139 and 1.

References

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