Answer in brief
CVE-2026-55529 records a Medium severity (CVSS 6.9) vulnerability in PraisonAI: Origin validation bypass in MCP HTTP Stream transport allows browser-mediated unauthenticated tool execution on local MCP server. The current sources do not mark it as known exploited. The current feed maps MervinPraison/PraisonAI (generic), PraisonAI (pip), praisonai (pypi). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps MervinPraison/PraisonAI (generic), PraisonAI (pip), praisonai (pypi). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| MervinPraison/PraisonAIgeneric | < 4.6.58 | Not reported |
| PraisonAIpip | <4.6.58 | 4.6.58 |
| praisonaipypi | >=0 <4.6.58 | 4.6.58 |
Published upstream
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 25, 2026
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.
Quoted source text, attributed separately from HOL analysis.