Answer in brief
CVE-2026-55156 records a Medium severity (CVSS 5.3) vulnerability in Token Optimizer MCP: Unauthenticated Path Traversal in Dashboard Session Log API Endpoints. The current sources do not mark it as known exploited. The current feed maps ooples/token-optimizer-mcp (generic), @ooples/token-optimizer-mcp (npm), @ooples/token-optimizer-mcp (npm). 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 5.3. 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 ooples/token-optimizer-mcp (generic), @ooples/token-optimizer-mcp (npm), @ooples/token-optimizer-mcp (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| ooples/token-optimizer-mcpgeneric | <5.1.0 | 5.1.0 |
| @ooples/token-optimizer-mcpnpm | <5.1.0 | 5.1.0 |
| @ooples/token-optimizer-mcpnpm | >=0 <5.1.0 | 5.1.0 |
Published upstream
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 14, 2026
Token Optimizer MCP measures token savings per AI coding agent, optimizes context, and shares a live local knowledge graph across 16 CLI clients. Prior to version 5.1.0, the dashboard HTTP server in token-optimizer-mcp exposes /api/session-summary and /api/session-events with no authentication middleware — any network-accessible client can reach them without credentials. Both handlers concatenate the caller-supplied sessionId query parameter directly into a filesystem path via path.join, and Node.js normalizes .. segments at resolution time, allowing an unauthenticated attacker to read any .jsonl file reachable from the server's filesystem. This issue has been patched in version 5.1.0.
Quoted source text, attributed separately from HOL analysis.