CVE-2026-40289: PraisonAI is a multi-agent teams system

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CRITICAL 9.1REMOTEUPGRADEUPGRADE

CVE-2026-40289 is a critical-severity flaw (CVSS 9.1) affecting praisonai, praisonaiagents. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PraisonAI is a multi-agent teams system. In versions below 4.5.139 of PraisonAI and 1.5.140 of praisonaiagents, the browser bridge (praisonai browser start) is vulnerable to unauthenticated remote session hijacking due to missing authentication and a bypassable origin check on its /ws WebSocket endpoint. The server binds to 0.0.0.0 by default and only validates the Origin header when one is present, meaning any non-browser client that omits the h

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-306
Published	2026-04-14
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: praison

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-14 04:17 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

praison praisonai UPGRADE

Affected: < 4.5.139

Fixed in: 4.5.139

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy praisonai || rpm -q praisonai || praisonai --version

2. UPGRADE to 4.5.139 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade praisonai

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade praisonai

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

praison praisonaiagents UPGRADE

Affected: < 1.5.140

Fixed in: 1.5.140

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show praisonaiagents

2. UPGRADE to 1.5.140

pip install --upgrade "praisonaiagents>=1.5.140"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40289?

praisonai: upgrade to 4.5.139; praisonaiagents: upgrade to 1.5.140. Exact commands for each OS are on this page.

Is CVE-2026-40289 being exploited?

CVE-2026-40289 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40289 affect?

CVE-2026-40289 affects praisonai, praisonaiagents. Severity is critical (CVSS 9.1). PraisonAI is a multi-agent teams system. In versions below 4.5.139 of PraisonAI and 1.5.140 of praisonaiagents, the browser bridge (praisonai browser start) is vulnerable to unauthenticated remote session hijacking due to missing authentica

How urgent is CVE-2026-40289?

Priority 51/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-40288 CRITICAL 9.8 UPGRADE UPGRADE PraisonAI is a multi-agent teams system
CVE-2026-40315 CRITICAL 9.8 UPGRADE PraisonAI is a multi-agent teams system
CVE-2026-40116 HIGH 7.5 UPGRADE PraisonAI is a multi-agent teams system
CVE-2026-40113 HIGH 8.4 UPGRADE PraisonAI is a multi-agent teams system
CVE-2026-40287 HIGH 8.4 UPGRADE UPGRADE PraisonAI is a multi-agent teams system

References

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