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Response snapshot Oct 29, 2026, 02:31 UTC

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VulnerabilityCVE-2026-61546

AnkiMCP is an Anki addon that implements an MCP server, enabling AI assistants to interact with the Anki flashcard application.

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.

At a glance

Exploited
Not known
Severity
8.8 High (CVSS 4.0)
Chance of exploitation
Not estimated
Sources
1 source

What to do

Check the vendor advisory for affected versions and fixes.

Read NVD CVE-2026-61546 (opens a new tab)

What happened

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.

Continue reading

Disabling protection for tunnels/proxies also disables it for the normal loopback configuration. This issue is fixed in version 0.21.0.

Scores and how they were measured

CVSS base severity

8.8

Version 4.0As of

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

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    NVD CVE-2026-61546 (opens a new tab)

    NVD record: description, CVSS (the CNA score is preferred), affected products, and publication date. Not evidence of exploitation.

    Published Checked

  2. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  3. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  4. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 28). AnkiMCP is an Anki addon that implements an MCP server, enabling AI assistants to interact with the Anki flashcard application. (CVE-2026-61546). https://kevwire.com/record/CVE-2026-61546

MLA

"AnkiMCP is an Anki addon that implements an MCP server, enabling AI assistants to interact with the Anki flashcard application. (CVE-2026-61546)." KEVWire, 28 Oct. 2026, kevwire.com/record/CVE-2026-61546.

Chicago

KEVWire. "AnkiMCP is an Anki addon that implements an MCP server, enabling AI assistants to interact with the Anki flashcard application. (CVE-2026-61546)." Last modified October 28, 2026. https://kevwire.com/record/CVE-2026-61546.

Evidence summary (plain text)

AnkiMCP is an Anki addon that implements an MCP server, enabling AI assistants to interact with the Anki flashcard application. (Oct 28, 2026).
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.
CVSS 8.8 (version 4.0; evidence as of Oct 28, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-61546).
Sources:
NVD CVE-2026-61546: https://nvd.nist.gov/vuln/detail/CVE-2026-61546
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-28T22:10:57.437Z&lastModEndDate=2026-10-28T23:40:59.953Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-28T21:41:00.548Z&lastModEndDate=2026-10-28T23:10:55.784Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-28T21:10:57.957Z&lastModEndDate=2026-10-28T22:40:57.609Z&resultsPerPage=500&startIndex=0
Record ID: CVE-2026-61546.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 28, 2026, 23:40 UTC. Ingestion is not an independent editorial investigation.

NVD status: Received. Publication in the NVD is not evidence of exploitation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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Record details

Record detail