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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 3
https://github.com/ankitects/anki/commit/b2b68d829e853da51b5de8aad6c13b53e90bc2…
security-advisories@github.com
https://github.com/ankitects/anki/releases/tag/25.09.4
security-advisories@github.com
https://github.com/ankitects/anki/security/advisories/GHSA-cw6h-ffmh-x6vh
security-advisories@github.com