Secuno
ENNL
Book demo

CVE-2026-40289

Praison Praisonai authentication bypass

9.1 CRITICALPublic exploitEPSS 0.52%
  1. Published14 Apr 2026

Description

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 header is accepted without restriction. An unauthenticated network attacker can connect, send a start_session message, and the server will route it to the first idle browser-extension WebSocket (effectively hijacking that session) and then broadcast all resulting automation actions and outputs back to the attacker. This enables unauthorized remote control of connected browser automation sessions, leakage of sensitive page context and automation results, and misuse of model-backed browser actions in any environment where the bridge is network-reachable. This issue has been fixed in versions 4.5.139 of PraisonAI and 1.5.140 of praisonaiagents.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Praison Praisonai< 4.5.139
Praison Praisonaiagents< 1.5.140

Remediation

Fixed in
Praison Praisonai≥ 4.5.139
Praison Praisonaiagents≥ 1.5.140

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-876899.8
The Metasploit Framework Web Service REST API (msf-ws) exposes the credential store…
CVE-2026-843138.8
Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, POST…
CVE-2026-1095759.8
In HAProxy Data Plane API 2.2.0 through 3.4.3 (and corresponding Enterprise Edition…
CVE-2026-571189.8
PraisonAI is a multi-agent teams system. Prior to praisonaiagents 1.6.59,…
CVE-2026-1093718.2
ZITADEL 3.0.0 before 4.18.0 contains a missing authentication vulnerability in the…
CVE-2026-1085498.1
cc-connect through 1.5.0 contains a missing authentication vulnerability in the MAX…

Frequently asked

Is CVE-2026-40289 being actively exploited?

CVE-2026-40289 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.52%.

How severe is CVE-2026-40289?

CVE-2026-40289 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.52% probability of exploitation.

Which products are affected by CVE-2026-40289?

Affected products include Praison Praisonai, Praison Praisonaiagents.

How do I fix CVE-2026-40289?

Upgrade affected software to a fixed version, for example Praison Praisonai 4.5.139, Praison Praisonaiagents 1.5.140 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-40289 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.