CVE-2026-49257 json
mcp-pinot: Unauthenticated tool invocation via default oauth_enabled=False + host 0.0.0.0 bind
published 2026-06-18 4 mo ago modified 2026-10-26 14 d ago also GHSA-73cv-556c-w3g6 , PYSEC-2026-410 , EUVD-2026-37951
- cvss
- 10.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 50%
- public exploits
- 0
- none known
Summary
mcp-pinot is a Python-based Model Context Protocol (MCP) server for interacting with Apache Pinot. In versions 3.0.1 and below, mcp-pinot defaults to running an HTTP MCP server bound to 0.0.0.0:8080 with no authentication enabled. All MCP tools, including SQL query execution, schema creation, and table-config mutation, are reachable by any network-adjacent caller. The server proxies these calls using server-side Pinot credentials, producing a confused-deputy condition that yields full read/write access to the configured Pinot cluster. This issue has been fixed in version 3.1.0
Patch / fix
- pypi mcp-pinot-server 3.1.0
- github.com/startreedata/mcp-pinot@1c7d3f9 commit
- github.com/startreedata/mcp-pinot#95 pull request
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- total
- Assessed
- 4 mo ago
Exploit prediction
0.62% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/startreedata/mcp-pinot/security/advisories/GHSA-73cv-556c-w3g6 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| OSV | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| GitHub | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | mcp-pinot-server | <3.1.0 |
3.1.0 |
Affected products
- startreedata mcp-pinot
Classification
- Weakness
-
- CWE-306 Missing Authentication for Critical Functionality
References
-
github.com
/startreedata/mcp-pinot/pull/95
web
-
github.com
/startreedata/mcp-pinot/commit/1c7d3f9cd384854bf72c127d230bdb32299475ad
web
-
github.com
/startreedata/mcp-pinot/security/advisories/GHSA-73cv-556c-w3g6
exploit, web
-
github.com
/startreedata/mcp-pinot/issues/90
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-49257
advisory
-
github.com
/startreedata/mcp-pinot
package
-
pypi.org
/project/mcp-pinot-server
package
-
github.com
/advisories/GHSA-73cv-556c-w3g6
advisory
Sources
- CVE List CVE-2026-49257
- GitHub Advisory GHSA-73cv-556c-w3g6
- NVD CVE-2026-49257
- OSV PYSEC-2026-410
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.