CVE-2026-58266

Anki: User scripts in iframes have access to the internal Anki API

CVE-2026-58266 has no fix on record yet for 1 affected product. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

6.5

No vendor severity

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0022

12th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
No fix yet
Anki (Windows apps)	No fix yet	no-fix	n/a

Details

Published
July 7, 2026
Weakness
CWE-346: Origin Validation Error
Vendor advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-58266

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