Browser control via unanchored WebSocket Origin regex
Published Aug 25, 2026 · Updated Aug 28, 2026
Authentication bypass in PraisonAI before 4.6.58 allows remote attackers to control connected browsers via a forged WebSocket Origin. Browser Server _handle_connection() uses re.match() with an unanchored 32-character extension pattern, so Origins with trailing characters pass before websocket.accept(). The default listener is localhost-only; remote exploitation requires remote binding, while local processes or localhost SSRF can steal cookies or capture screenshots.
Summary
What happened
Authentication bypass in PraisonAI before 4.6.58 allows remote attackers to control connected browsers via a forged WebSocket Origin. Browser Server _handle_connection() uses re.match() with an unanchored 32-character extension pattern, so Origins with trailing characters pass before websocket.accept(). The default listener is localhost-only; remote exploitation requires remote binding, while local processes or localhost SSRF can steal cookies or capture screenshots.
The record
- CVE
- CVE-2026-55536
- Published
- Aug 25, 2026
- Updated
- Aug 28, 2026
- Vendor
- PraisonAI
- Product
- PraisonAI
- Classifications
- CWE-625, CWE-284, T1539
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 25, 2026CVE publishedPublication date reported by the CVE source.
- Aug 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 4.6.58
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- PraisonAI forged-Origin WebSocket proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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