Uni-CLI legacy MCP HTTP transport accepts requests from web pages
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass, Tampering
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-346 and CWE-352.
Summary
Uni-CLI before 0.225.2 serves the legacy JSON-RPC-over-HTTP MCP transport on localhost without checking browser Origin headers (CWE-346). A malicious web page can send a simple cross-origin POST to the local /mcp endpoint and make tools/call requests to the user's Uni-CLI server if the user has started the MCP HTTP transport.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Description from the CNA
Uni-CLI gives people and agents one command interface for websites, browsers, desktop applications, local tools, and MCP. Prior to version 0.225.2, Uni-CLI exposed the legacy JSON-RPC-over-HTTP MCP transport on loopback without validating browser Origin headers before routing requests. A malicious web page could send a CORS simple POST request, such as text/plain, to the local /mcp endpoint and deliver a JSON-RPC body to the dispatcher. If the user had started the local MCP HTTP transport, that page could drive tools/call requests against the user's local Uni-CLI server. The Streamable HTTP transport already enforced this browser-to-localhost boundary. The legacy stateless HTTP path did not, so the two HTTP transports had drifted. This issue is about the browser-to-localhost boundary; it does not change Uni-CLI's local-code-execution trust model. This issue has been patched in version 0.225.2.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| olo-dot-io | Uni-CLI | before 0.225.2 | 0.225.2 | Patch available | CNA |
- Uni-CLI Vendorolo-dot-io Affected before 0.225.2 Fixed in 0.225.2 Patch available CNA
Remediation
Upgrade Uni-CLI to version 0.225.2, which patches this issue.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
- Fix · CNA Uni-CLI (olo-dot-io) Fixed in 0.225.2
Timeline
- 2026-10-23 Threatist record created from CVE-2026-58497
- 2026-10-23 CISA SSVC decision points changed
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences