CVE-2026-55536— Browser Server WebSocket origin validation bypass via unanchored regex (patch bypass of CVE-2026-40289 / GHSA-8x8f-54wf-vv92)
Quick assessment
Affected
MervinPraison PraisonAI
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
PraisonAI 是一个多智能体团队系统。在 praisonai 4.6.58 版本之前，Browser Server 的 方法使用 检查 Chrome 扩展的源，匹配的正则表达式为未锚定的 。由于该正则表达式未限制尾部字符，攻击者可以在匹配的 32 位字符后附加额外字符，从而绕过验证，在调用 之前发起 命令，导致未经授权的浏览器自动化操作。此问题已在版本 4.6.58 中得到修复。
Possible ATT&CK Techniques 1 AI
T1133 · External Remote Services
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I. Basic Information for CVE-2026-55536
Vulnerability Information
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Vulnerability Title
Browser Server WebSocket origin validation bypass via unanchored regex (patch bypass of CVE-2026-40289 / GHSA-8x8f-54wf-vv92)
Source: CVE Program / CVE List V5
Vulnerability Description
PraisonAI is a multi-agent teams system. Prior to praisonai 4.6.58, Browser Server _handle_connection() checks Chrome extension origins with re.match() and the unanchored expression chrome-extension://[a-z0-9]{32}. Extra trailing characters pass before websocket.accept(), allowing start_session commands and unauthorized browser automation. This issue is fixed in version 4.6.58.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| MervinPraison | PraisonAI | < 4.6.58 | - |
|
II. Public POCs for CVE-2026-55536
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
Qwen3.6-35B-A3B
· 7516 chars
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III. Intelligence Information for CVE-2026-55536
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Patches & Fixes for CVE-2026-55536 (1)
-
🔗 Release PraisonAI v4.6.58 · MervinPraison/PraisonAI · GitHub x_refsource_MISC
Vendor Advisories for CVE-2026-55536 (1)
Same Patch Batch · MervinPraison · 2026-08-25 · 17 CVEs total
| CVE-2026-55541 | 8.8 HIGH | PraisonAI: `--api-key` flag on `praisonai serve` is not properly enforced |
| CVE-2026-55534 | 8.6 HIGH | PraisonAI serve agents --api-key is ignored, allowing unauthenticated remote agent executi |
| CVE-2026-55539 | 8.6 HIGH | PraisonAI: [Auth Bypass] PraisonAI async Jobs API (`/api/v1/runs`) has no authentication — |
| CVE-2026-55526 | 8.5 HIGH | PraisonAI: SSRF protection bypass in `spider_tools._host_is_blocked()` via DNS-resolved ho |
| CVE-2026-55528 | 8.2 HIGH | praisonaiagents: AgentServer declares auth_token but never enforces it on any route (CWE-8 |
| CVE-2026-55533 | 8.2 HIGH | PraisonAI: Authentication fail-open in Recipe server allows unauthenticated access when AP |
| CVE-2026-55532 | 7.6 HIGH | PraisonAI: Origin-validation bypass (startswith prefix match) enables unauthenticated cros |
| CVE-2026-55525 | 7.5 HIGH | PraisonAI: SSRF via redirect-following in praisonaiagents web_crawl |
| CVE-2026-55538 | 7.3 HIGH | PraisonAI: [Auth Bypass] `praisonai serve agents --api-key` is silently ignored — agent-in |
| CVE-2026-55537 | 7.1 HIGH | PraisonAI: Webhook SSRF via DNS fail-open in `JobSubmitRequest.validate_webhook_url()` — b |
| CVE-2026-55527 | 7.1 HIGH | PraisonAI: Arbitrary file write via unsanitized `user_id` in `FileMemory.__init__()` — pat |
| CVE-2026-55540 | 7.1 HIGH | PraisonAI: [Path Traversal] agent tools escape the configured workspace via symlinks |
| CVE-2026-55529 | 6.9 MEDIUM | PraisonAI: Origin validation bypass in MCP HTTP Stream transport allows browser-mediated u |
| CVE-2026-55535 | 6.8 MEDIUM | PraisonAI: Server-Side Request Forgery via DNS rebinding bypass in webhook_url validation |
| CVE-2026-55531 | 6.5 MEDIUM | PraisonAI: Unauthenticated unbounded session accumulation in the PraisonAI MCP HTTP server |
| CVE-2026-55530 | 6.1 MEDIUM | PraisonAI: ast_grep_rewrite rewrites arbitrary files without the @require_approval gate en |
IV. Related Vulnerabilities
Same product: PraisonAI
-
CVE-2026-55532
PraisonAI: Origin-validation bypass (startswith prefix match -
CVE-2026-55533
PraisonAI: Authentication fail-open in Recipe server allows -
CVE-2026-55539
PraisonAI: [Auth Bypass] PraisonAI async Jobs API (`/api/v1/ -
CVE-2026-55527
PraisonAI: Arbitrary file write via unsanitized `user_id` in -
CVE-2026-55541
PraisonAI: `--api-key` flag on `praisonai serve` is not prop
Same vendor: MervinPraison
-
CVE-2026-55532
PraisonAI: Origin-validation bypass (startswith prefix match -
CVE-2026-55533
PraisonAI: Authentication fail-open in Recipe server allows -
CVE-2026-55539
PraisonAI: [Auth Bypass] PraisonAI async Jobs API (`/api/v1/ -
CVE-2026-55527
PraisonAI: Arbitrary file write via unsanitized `user_id` in -
CVE-2026-55541
PraisonAI: `--api-key` flag on `praisonai serve` is not prop
Same weakness: CWE-284
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V. Comments for CVE-2026-55536
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