Detections
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SCA: security update for fast-mcp-telegram (GHSA-rxw2-pc8j-vxwm)
critical Tenable Cloud Security Plugin ID 445953
Description
There are packages installed that are affected by a vulnerability referenced in the following CVE:- 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. (CVE-2026-52830)
Solution
Update the fast-mcp-telegram library and its related packages to version 0.19.1 or later.See Also
Plugin Details
Severity: Critical
ID: 445953
Version: Revision 1.1
Type: Local
Family: SCA Checks
Published: 8/13/2026
Updated: 8/13/2026
Risk Information
VPR
Risk Factor: Medium
Score: 4.5
Percentile: 57.58
Vendor
Vendor Severity: Critical
CVSS v2
Risk Factor: High
Base Score: 9.7
Temporal Score: 7.2
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:P
CVSS Score Source: CVE-2026-52830
CVSS v3
Risk Factor: Critical
Base Score: 9.4
Temporal Score: 8.2
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
Exploit Ease: No known exploits are available
Patch Publication Date: 7/2/2026
Vulnerability Publication Date: 7/2/2026
Reference Information
CVE: CVE-2026-52830