High
calibre Content Server `/book-update-annotations` Missing Write Authorization Check Allows Unauthorized Annotation Modification
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-73249
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 10:15 UTC · Revision 1
Source evidence
calibre Content Server `/book-update-annotations` Missing Write Authorization Check Allows Unauthorized Annotation Modification
core-osv · Original sourcePublished 11 Aug 2026, 21:58 UTC
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.
osv:CVE-2026-73249
Complete source record
{
"id": "5297d438f3e05d970c2861334e0efa5a51978bee1cb7380aac18c57eb7598ec5",
"url": "https://osv.dev/vulnerability/CVE-2026-73249",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "calibre Content Server `/book-update-annotations` Missing Write Authorization Check Allows Unauthorized Annotation Modification",
"summary": "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.",
"evidence": "osv:CVE-2026-73249",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-73249",
"aliases": [
"CVE-2026-73249",
"GHSA-5x64-w63v-x2g6"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/kovidgoyal/calibre",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "993dd952284ce4bb8199ddeef20643f94bb0b437"
},
{
"fixed": "71295e8b62801e1ccecaa4fac47e6942f11cfe1e"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "9.12.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "71295e8b62801e1ccecaa4fac47e6942f11cfe1e"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "993dd952284ce4bb8199ddeef20643f94bb0b437"
}
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"source": "REFERENCES_TAG",
"original_tag": "v9.12.0"
}
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}
}
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73249.json"
}
}
],
"modified": "2026-10-28T02:30:50.299737345Z",
"provider": "osv",
"references": [
"https://github.com/kovidgoyal/calibre/releases/tag/v9.12.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73249.json",
"https://github.com/kovidgoyal/calibre/security/advisories/GHSA-5x64-w63v-x2g6",
"https://nvd.nist.gov/vuln/detail/CVE-2026-73249",
"https://github.com/kovidgoyal/calibre/commit/71295e8b62801e1ccecaa4fac47e6942f11cfe1e"
],
"provider_metadata": {
"cwe_ids": [
"CWE-862"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73249.json"
}
},
"related_cves": [
{
"value": "CVE-2026-73249",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 518976,
"published_at": "2026-08-11T21:58:43.415+00:00"
}