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CVE-2026-55532— PraisonAI: Origin-validation bypass (startswith prefix match) enables unauthenticated cross-site request forgery against the PraisonAI MCP HTTP server

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.

MervinPraison PraisonAI是MervinPraison个人开发者的一个机器学习智能体平台。 MervinPraison PraisonAI 4.6.58之前版本存在安全漏洞，该漏洞源于MCP HTTP Stream _validate_origin对请求来源验证不当，使用request_origin.startswith(allowed)方式，导致攻击者控制的localhost.attacker.com来源可通过localhost白名单，网页可在无需预检和API密钥的情况下调用工具并写

CVSS 7.6 · High EPSS 0.20% · P9

Affected Version Matrix 1

VendorProduct Version RangeStatus
MervinPraison PraisonAI < 4.6.58 affected
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I. Basic Information for CVE-2026-55532

Vulnerability Information
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Vulnerability Title
PraisonAI: Origin-validation bypass (startswith prefix match) enables unauthenticated cross-site request forgery against the PraisonAI MCP HTTP server
Source: CVE Program / CVE List V5
Vulnerability Description
PraisonAI is a multi-agent teams system. Prior to praisonai 4.6.58, MCP HTTP Stream _validate_origin uses request_origin.startswith(allowed), allowing the attacker-controlled localhost.attacker.com HTTP origin to satisfy the localhost allowlist. A webpage can send Content-Type: text/plain requests without preflight and invoke tools/call without an API key, including file writes that persist agent instructions. 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:R/S:U/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
MervinPraison PraisonAI 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MervinPraison PraisonAI是MervinPraison个人开发者的一个机器学习智能体平台。 MervinPraison PraisonAI 4.6.58之前版本存在安全漏洞，该漏洞源于MCP HTTP Stream _validate_origin对请求来源验证不当，使用request_origin.startswith(allowed)方式，导致攻击者控制的localhost.attacker.com来源可通过localhost白名单，网页可在无需预检和API密钥的情况下调用工具并写
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-2026-55532

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: unauthenticated tools/call via attacker Origin http://localhost.attacker.com exfiltrated flag PROOF_6c9f5228cf12617a
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 9061 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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III. Intelligence Information for CVE-2026-55532

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Patches & Fixes for CVE-2026-55532 (1)

Vendor Advisories for CVE-2026-55532 (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-2026-55525 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
Same vendor: MervinPraison
Same weakness: CWE-346

V. Comments for CVE-2026-55532

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