EUVD-2026-88377Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Network-reachable tool needing an authorized MCP session (PR:L), no user interaction; full-read SSRF yields C:H, GET-only requests to internal endpoints give at most I:L, no availability impact.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
6DescriptionCVE.org
fast-mcp-telegram is a Telegram MCP Server. Prior to version 30.1, the send_message/send_message_to_phone MCP tools accept files as a list of http(s) URLs, which the server downloads and attaches to the outgoing Telegram message. Downloads are guarded by _validate_url_security, an SSRF denylist that checks the URL's literal hostname string but never resolves DNS. The fetch (httpx.AsyncClient.get) does its own resolution at request time. Consequently a hostname that resolves to a loopback / private / link-local address passes the guard and is fetched - even with the secure defaults block_private_ips=True and allow_http_urls=False. Because the fetched body is returned to the attacker as a Telegram file attachment, this is a full-read, exfiltrating SSRF, not blind. This issue has been patched in version 30.1.
Articles & Coverage 1
AnalysisAI
Server-side request forgery in fast-mcp-telegram prior to version 30.1 allows an authenticated MCP client (CVSS PR:L) to make the server fetch arbitrary internal HTTP(S) endpoints and receive the response body back as a Telegram file attachment. The send_message and send_message_to_phone tools accept URL lists that the server downloads via httpx.AsyncClient.get, but the _validate_url_security guard only inspects the literal hostname string and never resolves DNS, so any attacker-controlled domain that resolves to a loopback, private, or link-local address passes validation - even with the secure defaults block_private_ips=True and allow_http_urls=False. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the ability to invoke the send_message or send_message_to_phone MCP tools (an authenticated/authorized MCP client session, i.e. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N, base 7.1) describes a network-reachable, low-complexity flaw requiring low privileges - here, an authenticated MCP client session able to invoke the send_message/send_message_to_phone tools. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to the vendor-released fixed version 30.1 of fast-mcp-telegram (the corresponding release tag is 0.30.1, and the upstream patch is commit e6b3032cfc906e14f5b84f2c2b8ec378eb457e57), which adds DNS resolution of the target hostname and rejects any address that is loopback, private, or link-local before the fetch occurs; see the advisory https://github.com/leshchenko1979/fast-mcp-telegram/security/advisories/GHSA-xr72-j7vj-vp7g. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all fast-mcp-telegram deployments and their versions, confirm whether the MCP endpoint is reachable outside a trusted network segment, and rotate or narrowly scope MCP client tokens; where the service can be paused without breaking business workflows, do so, otherwise restrict inbound access to an allowlist of known client addresses and block outbound HTTP(S) from the host to loopback, RFC1918, and link-local ranges (including 169.254.169.254) at the egress firewall or container network policy. …
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External POC / Exploit Code
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