EUVD-2026-22211
GHSA-8x8f-54wf-vv92
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Lifecycle Timeline
6DescriptionGitHub Advisory
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.
AnalysisAI
Unauthenticated remote session hijacking in PraisonAI's browser bridge (versions <4.5.139) and praisonaiagents (<1.5.140) allows network attackers to control browser automation sessions without authentication. The /ws WebSocket endpoint accepts connections from any client omitting the Origin header, enabling attackers to send start_session commands that hijack idle browser-extension sessions and receive all automation outputs. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | PraisonAI versions below 4.5.139 and praisonaiagents below 1.5.140 with browser bridge enabled (praisonai browser start). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This vulnerability presents critical real-world risk despite lacking confirmed active exploitation signals. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A remote attacker on the same network or internet-facing deployment identifies the PraisonAI browser bridge listening on default port (network scan or service fingerprinting). Using a simple Python WebSocket client or curl, the attacker establishes a connection to the /ws endpoint without including an Origin header, bypassing the conditional validation. … |
| Remediation | Immediately upgrade to patched versions: PraisonAI 4.5.139 or later, and praisonaiagents 1.5.140 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all systems running PraisonAI browser bridge <4.5.139 or praisonaiagents <1.5.140 and isolate them from untrusted networks (implement network segmentation or temporary firewall rules blocking external access to WebSocket endpoints). …
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