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CVE-2026-52830

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 fil
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:425524e70728b33dd8ebbf42603a2dcf16d5e11dd245bccd0faa4f9fe22de10e
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-22","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:041eb014509d473439f2b9af114c7f59a9477f48d123394f5e8dbe8ced3a48cd · sha256:cba1b14520a31700… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:041eb014509d473439f2b9af114c7f59a9477f48d123394f5e8dbe8ced3a48cd · sha256:cba1b14520a31700… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"fast-mcp-telegram","vendor":"leshchenko1979","versions":[{"status":"affected","version":"< 0.19.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:041eb014509d473439f2b9af114c7f59a9477f48d123394f5e8dbe8ced3a48cd · sha256:cba1b14520a31700… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":9.4,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:041eb014509d473439f2b9af114c7f59a9477f48d123394f5e8dbe8ced3a48cd · sha256:cba1b14520a31700… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-22","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:041eb014509d473439f2b9af114c7f59a9477f48d123394f5e8dbe8ced3a48cd · sha256:cba1b14520a31700… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:041eb014509d473439f2b9af114c7f59a9477f48d123394f5e8dbe8ced3a48cd · sha256:cba1b14520a31700… · /containers/cna/problemTypes/1/descriptions/0

Source references

3 source assertions
{"tags":["exploit"],"url":"https://github.com/advisories/GHSA-rxw2-pc8j-vxwm"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:041eb014509d473439f2b9af114c7f59a9477f48d123394f5e8dbe8ced3a48cd · sha256:cba1b14520a31700… · /containers/adp/0/references/0
{"name":"https://github.com/advisories/GHSA-rxw2-pc8j-vxwm","tags":["x_refsource_MISC"],"url":"https://github.com/advisories/GHSA-rxw2-pc8j-vxwm"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:041eb014509d473439f2b9af114c7f59a9477f48d123394f5e8dbe8ced3a48cd · sha256:cba1b14520a31700… · /containers/cna/references/1
{"name":"https://web.archive.org/web/20250926152207/https://github.com/leshchenko1979/fast-mcp-telegram","tags":["x_refsource_CONFIRM"],"url":"https://web.archive.org/web/20250926152207/https://github.com/leshchenko1979/fast-mcp-telegram"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:041eb014509d473439f2b9af114c7f59a9477f48d123394f5e8dbe8ced3a48cd · sha256:cba1b14520a31700… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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