{"cve":"CVE-2026-40289","nvd":{"published":"2026-04-14T04:17:12.710","modified":"2026-10-26T22:10:00.163","status":"Analyzed","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-306"],"references":["https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-8x8f-54wf-vv92"],"products":["praison:praisonai","praison:praisonaiagents"],"source":"nvd","synced_at":"2026-10-26T22:26:44.656832877+00:00"},"epss":{"cve":"CVE-2026-40289","score":0.00421,"percentile":0.36166,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-8x8f-54wf-vv92","url":"https://osv.dev/vulnerability/GHSA-8x8f-54wf-vv92","summary":"PraisonAI Browser Server allows unauthenticated WebSocket clients to hijack connected extension sessions","modified":"2026-06-29T12:26:14.563826598Z","packages":[{"ecosystem":"PyPI","name":"praisonaiagents","purl":"pkg:pypi/praisonaiagents","ranges":["<1.5.140"],"fixed":["1.5.140"]},{"ecosystem":"PyPI","name":"praisonai","purl":"pkg:pypi/praisonai","ranges":["<4.5.139"],"fixed":["4.5.139"]}]},{"id":"PYSEC-2026-467","url":"https://osv.dev/vulnerability/PYSEC-2026-467","summary":"PraisonAI Browser Server allows unauthenticated WebSocket clients to hijack connected extension sessions","modified":"2026-07-13T16:15:31.939145199Z","packages":[{"ecosystem":"PyPI","name":"praisonai","purl":"pkg:pypi/praisonai","ranges":["<4.5.139"],"fixed":["4.5.139"]}]},{"id":"PYSEC-2026-485","url":"https://osv.dev/vulnerability/PYSEC-2026-485","summary":"PraisonAI Browser Server allows unauthenticated WebSocket clients to hijack connected extension sessions","modified":"2026-07-13T16:15:33.091019497Z","packages":[{"ecosystem":"PyPI","name":"praisonaiagents","purl":"pkg:pypi/praisonaiagents","ranges":["<1.5.140"],"fixed":["1.5.140"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}