Is CVE-2026-73249 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-73249?

CVE-2026-73249 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-73249

Description

calibre is an e-book manager. Prior to 9.12.0, the calibre Content Server endpoint POST /book-update-annotations/{library_id}/{book_id}/{fmt} in src/calibre/srv/books.py omits needs_db_write=True, causing Router.dispatch() to skip ctx.check_for_write_access() before update_annotations() passes attacker-controlled JSON to db.merge_annotations_for_book(), which allows a readonly user or an anonymous user on an unauthenticated deployment to persist unauthorized book annotation changes. This issue is fixed in version 9.12.0.