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CVE-2026-55529— PraisonAI: Origin validation bypass in MCP HTTP Stream transport allows browser-mediated unauthenticated tool execution on local MCP server

Quick assessment

Affected
MervinPraison PraisonAI
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mervin Praison PraisonAI是Mervin Praison个人开发者开源的一个低代码多智能体协作框架。 Mervin Praison PraisonAI 4.6.58之前版本存在安全漏洞，该漏洞源于MCP HTTP Stream _validate_origin方法使用request_origin.startswith(allowed)进行源验证，导致攻击者控制的localhost.evil.example源匹配localhost白名单，未经身份验证的恶意网页可向本地MCP服务器提交t

CVSS 6.9 · Medium EPSS 0.18% · P6

Affected Version Matrix 1

VendorProduct Version RangeStatus
MervinPraison PraisonAI < 4.6.58 affected
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I. Basic Information for CVE-2026-55529

Vulnerability Information
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Vulnerability Title
PraisonAI: Origin validation bypass in MCP HTTP Stream transport allows browser-mediated unauthenticated tool execution on local MCP server
Source: CVE Program / CVE List V5
Vulnerability Description
PraisonAI is a multi-agent teams system. Prior to praisonai 4.6.58, the MCP HTTP Stream _validate_origin method accepts request_origin.startswith(allowed), so the attacker-controlled localhost.evil.example HTTP origin matches the localhost allowlist. Without an API key, a malicious webpage can submit tools/call requests to the local MCP server and execute exposed tools. This issue is fixed in version 4.6.58.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Mervin Praison PraisonAI 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mervin Praison PraisonAI是Mervin Praison个人开发者开源的一个低代码多智能体协作框架。 Mervin Praison PraisonAI 4.6.58之前版本存在安全漏洞，该漏洞源于MCP HTTP Stream _validate_origin方法使用request_origin.startswith(allowed)进行源验证，导致攻击者控制的localhost.evil.example源匹配localhost白名单，未经身份验证的恶意网页可向本地MCP服务器提交t
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MervinPraison PraisonAI < 4.6.58 -

II. Public POCs for CVE-2026-55529

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III. Intelligence Information for CVE-2026-55529

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Patches & Fixes for CVE-2026-55529 (1)

Vendor Advisories for CVE-2026-55529 (1)

Same Patch Batch · MervinPraison · 2026-08-25 · 17 CVEs total

CVE-2026-55536 9.1 CRITICAL Browser Server WebSocket origin validation bypass via unanchored regex (patch bypass of CV
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-2026-55535 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
Same vendor: MervinPraison
Same weakness: CWE-306

V. Comments for CVE-2026-55529

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