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Tracking
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| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-rxw2-pc8j-vxwm | fast-mcp-telegram: Bearer token path traversal bypasses reserved Telegram session protection |
Mon, 06 Jul 2026 23:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Leshchenko1979
Leshchenko1979 fast-mcp-telegram |
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| Vendors & Products |
Leshchenko1979
Leshchenko1979 fast-mcp-telegram |
Mon, 06 Jul 2026 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Thu, 02 Jul 2026 21:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | fast-mcp-telegram is a Telegram MCP Server. Prior to 0.19.1, fast-mcp-telegram validates HTTP Bearer tokens by joining the raw token string into a session-file path. The verifier rejects the exact reserved token telegram, but it does not reject path separators or normalize the path before checking whether the session file exists. A remote HTTP client can therefore authenticate as the default legacy session with a token such as ../fast-mcp-telegram/telegram when the documented default session file ~/.config/fast-mcp-telegram/telegram.session exists. This bypasses the reserved session name control that is intended to prevent HTTP multi-user sessions from colliding with the default stdio or legacy account. With account-prefixed MCP tools enabled, the attacker still sees and calls the prefixed tools for the default account, so the prefix middleware does not stop the session selection bypass. This vulnerability is fixed in 0.19.1. | |
| Title | fast-mcp-telegram: Bearer token path traversal bypasses reserved Telegram session protection | |
| Weaknesses | CWE-22 CWE-287 |
|
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-07-06T14:36:02.848Z
Reserved: 2026-06-08T18:11:06.662Z
Link: CVE-2026-52830
Updated: 2026-07-06T14:34:06.905Z
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OpenCVE Enrichment
Updated: 2026-07-08T00:00:05Z
Github GHSA