CVE-2026-30857 WeKnora: Unauthorized Cross‑Tenant Knowledge Base Cloning
Authenticated users can clone other tenants' knowledge bases by guessing IDs, leading to cross-tenant data exfiltration.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-30857?
CVE-2026-30857 is a medium-severity missing authorization vulnerability in Tencent WeKnora, published on 7 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
WeKnora is an LLM-powered framework designed for deep document understanding and semantic retrieval. Prior to version 0.3.0, a cross-tenant authorization bypass in the knowledge base copy endpoint allows any authenticated user to clone (duplicate) another tenant’s knowledge base into their own tenant by knowing/guessing the source knowledge base ID. This enables bulk data exfiltration (document/FAQ content) across tenants. This issue has been patched in version 0.3.0.
Weakness: CWE-639
Which versions are affected by CVE-2026-30857?
3 open source packages ship an affected version, including github.com/Tencent/WeKnora. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/Tencent/WeKnora Go | All versions | None |
github.com/Tencent/WeKnora Go | All versions | 0.3.0 |
github.com/Tencent/WeKnora Go | All versions | 0.3.0 |
Products include Tencent Weknora.
How do I fix CVE-2026-30857?
Upgrade github.com/Tencent/WeKnora to 0.3.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-30857 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-30857 exists.
Other vulnerabilities in Tencent WeKnora
- CVE-2026-30860 WeKnora: Remote Code Execution via SQL Injection Bypass in AI Database Query Tool
- CVE-2026-30861 WeKnora: Remote Code Execution (RCE) via Command Injection in MCP Stdio Configuration Validation
- CVE-2026-22688 WeKnora has Command Injection in MCP stdio test
- CVE-2026-30855 WeKnora: Broken Access Control in Tenant Management
- CVE-2025-11046 Tencent WeKnora test testEmbeddingModel server-side request forgery
Sources
Also known as GHSA-8rf9-c59g-f82f, GO-2026-4640.