Vulnerability · Published Oct 23, 2026 · Assigned by GitHub_M
CVE-2026-58497Uni-CLI: Legacy HTTP MCP transport accepted browser-originated localhost requests
High 8.6
In plain English
A high-severity cross-site request forgery in Uni-CLI from olo-dot-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @zenalexa/unicli | 0.225.2 | GHSA-v3f4-w7r7-v3hm |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| olo-dot-io | Uni-CLI | < 0.225.2 |
Weakness: CWE-346, CWE-352 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/olo-dot-io/Uni-CLI/security/advisories/GHSA-v3f4-w7r7-v3hm x_refsource_CONFIRM
- https://github.com/olo-dot-io/Uni-CLI/releases/tag/v0.225.2 x_refsource_MISC