CVE Explorer

CVE-2026-55604

DeepSeek MCP Server is an MCP server for DeepSeek V4. Starting in version 1.4.2 and prior to version 1.7.0, the process-global `SessionStore` accepts caller-supplied `session_id` values without binding them to any authenticated principal or transport session. An attacker can enumerate active session IDs via `deepseek_sessions`, then reuse a victim-controlled `session_id` in `deepseek_chat` to retrieve and continue the victim's conversation context. Version 1.7.0 contains a patch.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ed4180c621c364c73700582e1e7694b2250809be2c0c1543479b04b15f4d4216

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"deepseek-mcp-server","vendor":"arikusi","versions":[{"status":"affected","version":">= 1.4.2, < 1.7.0"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:267ddd65f94ba5cd5df88b0016b392920e596f930f6ecbe6879e5021058811d2 · sha256:78d5d426430ee641… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":8.6,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:267ddd65f94ba5cd5df88b0016b392920e596f930f6ecbe6879e5021058811d2 · sha256:78d5d426430ee641… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-639","description":"CWE-639: Authorization Bypass Through User-Controlled Key","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:267ddd65f94ba5cd5df88b0016b392920e596f930f6ecbe6879e5021058811d2 · sha256:78d5d426430ee641… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"name":"https://github.com/arikusi/deepseek-mcp-server/releases/tag/v1.7.0","tags":["x_refsource_MISC"],"url":"https://github.com/arikusi/deepseek-mcp-server/releases/tag/v1.7.0"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:267ddd65f94ba5cd5df88b0016b392920e596f930f6ecbe6879e5021058811d2 · sha256:78d5d426430ee641… · /containers/cna/references/1

{"tags":["exploit"],"url":"https://github.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:267ddd65f94ba5cd5df88b0016b392920e596f930f6ecbe6879e5021058811d2 · sha256:78d5d426430ee641… · /containers/adp/0/references/0

{"name":"https://github.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578","tags":["x_refsource_CONFIRM"],"url":"https://github.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:267ddd65f94ba5cd5df88b0016b392920e596f930f6ecbe6879e5021058811d2 · sha256:78d5d426430ee641… · /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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