PatchTheCVECVE-2021-41563: Tad Book3 editing book function does not filter special characters
CVE-2021-41563 is a medium-severity flaw (CVSS 6.1) affecting tad book3. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Tad Book3 editing book function does not filter special characters. Unauthenticated attackers can remotely inject JavaScript syntax and execute stored XSS attacks.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.1 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.6% (top 50%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2021-10-08 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-41563?
tad book3: upgrade to 3.9. Exact commands for each OS are on this page.
Is CVE-2021-41563 being exploited?
CVE-2021-41563 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-41563 affect?
CVE-2021-41563 affects tad book3. Severity is medium (CVSS 6.1). Tad Book3 editing book function does not filter special characters. Unauthenticated attackers can remotely inject JavaScript syntax and execute stored XSS attacks.
How urgent is CVE-2021-41563?
Priority 34/100. No elevated risk signals yet.
Related CVEs
- CVE-2021-41974 CRITICAL 9.1 UPGRADE Tad Book3 editing book page does not perform identity verification