Vulnerability · Published Mar 7, 2026 · Assigned by GitHub_M

CVE-2026-30856WeKnora: Tool Execution Hijacking via Ambigous Naming Convention In MCP client and Indirect Prompt Injection

Medium 5.9

In plain English

A medium-severity security flaw in WeKnora from Tencent. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.9Medium

Exploit odds (30 days)0.3%top 78.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

WeKnora is an LLM-powered framework designed for deep document understanding and semantic retrieval. Prior to version 0.3.0, a vulnerability involving tool name collision and indirect prompt injection allows a malicious remote MCP server to hijack tool execution. By exploiting an ambiguous naming convention in the MCP client (mcp_{service}_{tool}), an attacker can register a malicious tool that overwrites a legitimate one (e.g., tavily_extract). This enables the attacker to redirect LLM execution flow, exfiltrate system prompts, context, and potentially execute other tools with the user's privileges. This issue has been patched in version 0.3.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/Tencent/WeKnora	0.3.0	GHSA-67q9-58vj-32qx
Go	github.com/Tencent/WeKnora	no fix listed	GO-2026-4638

Affected products (as reported)

Vendor	Product	Versions
Tencent	WeKnora	< 0.3.0

Weakness: CWE-706 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:L

References

https://github.com/Tencent/WeKnora/security/advisories/GHSA-67q9-58vj-32qx x_refsource_CONFIRM