CVE-2021-41563Network attack vector

Stored XSS via unfiltered book name

Published Oct 8, 2021 · Updated Sep 16, 2024

Stored XSS in Tad Book3 3.89 and earlier allows remote attackers to inject JavaScript through a crafted book name. The book-editing function stores the name parameter without filtering special characters, causing the script to execute when the saved content is viewed. No authentication is required to inject the payload, but execution requires another user to view the affected page; the demonstrated impact is script execution in that user's browser.

CVSS severity6.1
Medium
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Tad Book3 3.89 and earlier allows remote attackers to inject JavaScript through a crafted book name. The book-editing function stores the name parameter without filtering special characters, causing the script to execute when the saved content is viewed. No authentication is required to inject the payload, but execution requires another user to view the affected page; the demonstrated impact is script execution in that user's browser.

The record

CVE
CVE-2021-41563
Published
Oct 8, 2021
Updated
Sep 16, 2024
Vendor
Tad
Product
Tad Book3
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=3.89

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tad · Tad Book3version=0 <=3.89

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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