CVE-2026-40289: MervinPraison PraisonAI · Missing Authentication
Affects MervinPraison PraisonAISource CVE Database V5
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
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:NExploitation evidence
Disclosed: evidence found.
CVE published 14 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| MervinPraisonPraisonAI | Affected
| Fixed in
|
| MervinPraisonpraisonaiagents | Affected
| Fixed in
|
GitHubmervinpraison/PraisonAIpkg:github/mervinpraison/PraisonAIOther threats | Affected
| Fixed in
|
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.