How severe is CVE-2026-30856?

CVE-2026-30856 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity low, and availability low.

Is CVE-2026-30856 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-30856?

CVE-2026-30856 affects Tencent Weknora. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-30856?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-30856 have an EU (EUVD) identifier?

Yes. CVE-2026-30856 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10179.

When was CVE-2026-30856 published?

CVE-2026-30856 was published on 2026-03-07 and last updated on 2026-06-17.

CVE-2026-30856

CVE-2026-30856 is a medium-severity vulnerability in Tencent Weknora with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-706.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10179
Weakness: CWE-706
Affected product: Tencent Weknora
Published: 2026-03-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-30856?: 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.
How severe is CVE-2026-30856?: CVE-2026-30856 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity low, and availability low.
Is CVE-2026-30856 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-30856?: CVE-2026-30856 affects Tencent Weknora. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-30856?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-30856 have an EU (EUVD) identifier?: Yes. CVE-2026-30856 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10179.
When was CVE-2026-30856 published?: CVE-2026-30856 was published on 2026-03-07 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:tencent:weknora:*:*:*:*:*:*:*:*

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