CVE-2026-59153
lowpriority · track · 0EPSS 0.003 · 18 %ileEUUSEPSS · scored 2026-10-27
Anki is a program for creating and reviewing flashcards. Prior to 25.09.3, Anki launches a local HTTP server to serve media files and web pages for parts of its interface, but requests from other origins were not sufficiently blocked. A malicious website could potentially trigger side-effecting requests to the local server, with severity varying by browser depending on Private Network Access protections. This issue is fixed in version 25.09.3.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
advisories (2)
Vendor and ecosystem advisories describing this.
- GHSA-869j-r97x-hx2gAnki's local HTTP server does not sufficiently validate requests2026-06-19ghsa · osvUS
## Summary Anki launches a local HTTP server to serve media files and web pages for parts of its interface. While the server has a CORS setup, requests from other origins were not blocked, allowing malicious websites to potentially trigger side-effecting requests. ## Browser impact The severity varies by browser because of Private Network Access (PNA), a newer spec that restricts web pages from making requests to localhost/local network addresses: Chrome/Chromium (including Edge, Brave): Largely protected, as Chrome has implemented PNA restrictions for several years and now puts local network access behind a permission prompt. Safari: Hasn't implemented PNA yet, though macOS has some OS-level protections. Firefox: Most vulnerable — hasn't implemented PNA yet, though it's reportedly planned for Firefox 151. ## Patches The issue was fixed as of Anki 25.09.3 ### References https://x.com/taviso/status/2051310678800253318
- PYSEC-2026-3459Anki's local HTTP server does not sufficiently validate requests2026-07-23vendor · osvUS
## Summary Anki launches a local HTTP server to serve media files and web pages for parts of its interface. While the server has a CORS setup, requests from other origins were not blocked, allowing malicious websites to potentially trigger side-effecting requests. ## Browser impact The severity varies by browser because of Private Network Access (PNA), a newer spec that restricts web pages from making requests to localhost/local network addresses: Chrome/Chromium (including Edge, Brave): Largely protected, as Chrome has implemented PNA restrictions for several years and now puts local network access behind a permission prompt. Safari: Hasn't implemented PNA yet, though macOS has some OS-level protections. Firefox: Most vulnerable — hasn't implemented PNA yet, though it's reportedly planned for Firefox 151. ## Patches The issue was fixed as of Anki 25.09.3 ### References https://x.com/taviso/status/2051310678800253318
also known as (5)
Other names and identifiers for this entity.
sources
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references (12)
External citations — patches, advisories, analysis.
- https://github.com/ankitects/anki/commit/858e5689d0e4fd24f74856c7e8f245412694a219cnnvd
- https://github.com/ankitects/anki/releases/tag/25.09.3cnnvd
- https://github.com/ankitects/anki/security/advisories/GHSA-869j-r97x-hx2gcnnvd
- https://x.com/taviso/status/2051310678800253318cnnvd
- https://github.com/ankitects/anki/commit/858e5689d0e4fd24f74856c7e8f245412694a219enisa_euvd
- https://github.com/ankitects/anki/releases/tag/25.09.3enisa_euvd
- https://github.com/ankitects/anki/security/advisories/GHSA-869j-r97x-hx2genisa_euvd
- https://x.com/taviso/status/2051310678800253318enisa_euvd
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