{"id":"CVE-2026-61546","aliases":[],"cve":{"records":[{"id":"CVE-2026-61546","source":"GitHub_M","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-07-10T16:27:03.094Z","published":"2026-10-28T21:40:16.081Z","modified":"2026-10-29T18:24:59.680Z"}],"publishers":[{"name":"GitHub_M","role":"CNA","organizationId":"a0819718-46f1-4df5-94e2-005712e83aaa","modified":"2026-10-28T21:40:16.081Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-29T18:24:59.680Z"}],"references":[{"url":"https://github.com/ankimcp/anki-mcp-server-addon/security/advisories/GHSA-j9xx-59ph-wmr6","tags":["x_refsource_CONFIRM"],"source":"GitHub_M"},{"url":"https://github.com/ankimcp/anki-mcp-server-addon/commit/6dcb6939b0ecc0801f45cf0d241dc946aad1654f","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/ankimcp/anki-mcp-server-addon/commit/d5306ff42d68f1e3b82a96878eb059437e820316","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/ankimcp/anki-mcp-server-addon/tree/v0.21.0","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/ankimcp/anki-mcp-server-addon/security/advisories/GHSA-j9xx-59ph-wmr6","tags":["exploit"],"source":"CISA-ADP"}],"weaknesses":[{"id":"CWE-346","description":"CWE-346: Origin Validation Error","source":"GitHub_M"},{"id":"CWE-350","description":"CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action","source":"GitHub_M"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-29T18:24:19.481141Z","decisions":[{"name":"Exploitation","value":"poc"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"total"}]}]},"title":"AnkiMCP: DNS rebinding reaches unauthenticated local AnkiMCP HTTP tools","titleSource":"GitHub_M","descriptionSource":"GitHub_M","description":"AnkiMCP is an Anki addon that implements an MCP server, enabling AI assistants to interact with the Anki flashcard application. Prior to version 0.21.0, `anki_mcp_server/mcp_server.py` globally disables FastMCP DNS-rebinding protection through `TransportSecuritySettings` with `enable_dns_rebinding_protection=False`, including for the default local Streamable HTTP listener. The defaults in `anki_mcp_server/config.py` enable `http_enabled` on `127.0.0.1:3141`, with an empty `http_path` selecting the root endpoint. No bearer token, API key, session secret, strict `Host` allowlist or strict `Origin` allowlist is enforced before `initialize`, `tools/list` and `tools/call` reach MCP dispatch. A victim who visits a malicious web page while Anki and the listener are running can have browser requests rebound to loopback, allowing the attacker to `initialize` MCP, enumerate tools, read the local collection, and perform enabled non-destructive note/deck creation or updates. The attacker needs neither LAN position nor a local process. Available operations depend on enabled tool filters; destructive tools are hidden unless `enabled_destructive_tools` is opted into, limiting deletion-level impact but not the exposed read/write operations. The reported harness confirms real MCP tool dispatch with substituted Anki bridge responses rather than demonstrating destructive changes to a real collection. Disabling protection for tunnels/proxies also disables it for the normal loopback configuration. This issue is fixed in version 0.21.0.","score":8.8,"severity":"high","published":"2026-10-28T21:40:16.081Z","modified":"2026-10-29T18:24:59.680Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"ankimcp","name":"anki-mcp-server-addon","platforms":[],"versions":[{"version":"< 0.21.0","status":"affected"}],"cpes":[],"source":"GitHub_M","url":"https://www.cve.org/CVERecord?id=CVE-2026-61546"}],"remediation":[],"references":["https://github.com/ankimcp/anki-mcp-server-addon/security/advisories/GHSA-j9xx-59ph-wmr6","https://github.com/ankimcp/anki-mcp-server-addon/commit/6dcb6939b0ecc0801f45cf0d241dc946aad1654f","https://github.com/ankimcp/anki-mcp-server-addon/commit/d5306ff42d68f1e3b82a96878eb059437e820316","https://github.com/ankimcp/anki-mcp-server-addon/tree/v0.21.0"],"sources":[{"name":"CVE","id":"CVE-2026-61546","modified":"2026-10-29T18:24:59.680Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-61546"}],"assessments":[{"source":"GitHub_M","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N","score":8.8}],"sourceAffected":[],"observedAt":"2026-10-29T18:49:22.195Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T00:50:33.640Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-28T23:00:39.839Z","attemptedAt":"2026-10-28T23:00:39.839Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-10-28T23:00:38.002Z","attemptedAt":"2026-10-28T23:00:38.002Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-28T23:00:38.799Z","attemptedAt":"2026-10-28T23:00:38.799Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-10-28T23:00:38.170Z","attemptedAt":"2026-10-28T23:00:38.170Z"}],"evidence":[{"source":"ENISA EUVD","id":"EUVD-2026-112504","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-112504","modified":"Oct 28, 2026, 9:40:16 PM","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N","checkedAt":"2026-10-28T23:00:38.799Z"},{"source":"NVD","id":"CVE-2026-61546","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61546","modified":"2026-10-28T22:17:15.590","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","checkedAt":"2026-10-28T23:00:39.839Z"}],"aiSummary":{"text":"AnkiMCP versions prior to 0.21.0 have a weakness that allows an attacker to access local AnkiMCP HTTP tools via DNS rebinding, potentially reading or modifying the local collection. The attacker needs to trick a victim into visiting a malicious web page. Impact depends on enabled tool filters.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T09:51:25.412Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-61546"}]}}