CVE-2021-41974: Tad Book3 - Improper Authorization

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-10-08 · updated 2026-06-17
Weakness: CWE-285

Description

Tad Book3 editing book page does not perform identity verification. Remote attackers can use the vulnerability to view and modify arbitrary content of books without permission.

Affected products

Tad Book3: before 3.9 — fixed in 3.9

How to fix

Upgrade to a fixed version: Tad Book3 3.9. Check the vendor advisory for mitigations.

References

https://www.twcert.org.tw/tw/cp-132-5173-e21ba-1.html
https://www.twcert.org.tw/tw/cp-132-5173-e21ba-1.html

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