Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-73249— calibre Content Server `/book-update-annotations` Missing Write Authorization Check Allows Unauthorized Annotation Modification

Quick assessment

Affected
kovidgoyal calibre
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kovidgoyal calibre是Kovidgoyal个人开发者的一款电子书管理软件。 Kovidgoyal calibre 9.12.0之前版本存在授权问题漏洞，该漏洞源于calibre Content Server的/book-update-annotations端点（src/calibre/srv/books.py）缺少写访问权限检查，可能允许只读用户或匿名用户持久化未授权的书注解更改。

CVSS 7.5 · High EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
kovidgoyal calibre < 9.12.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-73249

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
calibre Content Server `/book-update-annotations` Missing Write Authorization Check Allows Unauthorized Annotation Modification
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Kovidgoyal calibre 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kovidgoyal calibre是Kovidgoyal个人开发者的一款电子书管理软件。 Kovidgoyal calibre 9.12.0之前版本存在授权问题漏洞，该漏洞源于calibre Content Server的/book-update-annotations端点（src/calibre/srv/books.py）缺少写访问权限检查，可能允许只读用户或匿名用户持久化未授权的书注解更改。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
kovidgoyal calibre < 9.12.0 -

II. Public POCs for CVE-2026-73249

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6929 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-73249

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-73249 (1)

Vendor Advisories for CVE-2026-73249 (1)

Vendor Pages for CVE-2026-73249 (1)

IV. Related Vulnerabilities

Same product: calibre
Same vendor: kovidgoyal
Same weakness: CWE-862

V. Comments for CVE-2026-73249

No comments yet

Leave a comment