CVE-2026-77519
5.4 MEDIUMpublic exploit availablePublished 2026-09-21 · Updated 2026-09-21
AI risk analysis
- Summary
- The flaw allows an attacker to exploit a previously valid, non-permanent application key that remains active after expiration to access and manipulate MCP endpoint functionalities.
- Exploitability
- Exploitation requires knowledge of the expired but still active ApplicationApiKey secret; it is moderately difficult due to the need for API key manipulation.
- Blast radius
- If exploited, this could lead to unauthorized access, data manipulation, and potential misuse of enterprise tools through the MCP endpoint.
- Prioritized remediation
- Discontinue use of non-permanent application keys or implement stricter validation checks on key expiration and permanent status before allowing access.
Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.
NVD description
MaxKB is an open-source AI assistant for enterprise. In 2.10.2-lts and earlier, the /chat/api/mcp authentication path looks up an ApplicationApiKey using only its secret and active status, without enforcing the is_permanent and expire_time checks used by the standard chat API. A previously valid, non-permanent application key that remains active after expiration can initialize the MCP endpoint, list the published application's tool metadata, invoke tools/call, and create durable application_chat and application_chat_record state even though /chat/api/open rejects the same key. No fixed version is available as of this review.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weaknesses
CWE-613
Public exploit & PoC references
All references
Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.
Related CVEs
Related by shared AI tags and CWE weakness class. Browse the full archive.