CVE-2021-24326Public exploitNetwork attack vector

Authenticated reflected XSS via unsanitized tab attribute

Published May 17, 2021 · Updated Aug 3, 2024

Reflected XSS in Clogica All 404 Redirect to Homepage before 1.21 allows remote authenticated users to execute script via a crafted tab value. The plugin settings page writes the unsanitized tab query parameter into an HTML attribute, enabling attribute breakout and event-handler injection. A low-privileged authenticated user must induce another user to open the crafted settings-page URL; exploitation runs script in that user's browser context.

CVSS severity5.4
Medium
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Clogica All 404 Redirect to Homepage before 1.21 allows remote authenticated users to execute script via a crafted tab value. The plugin settings page writes the unsanitized tab query parameter into an HTML attribute, enabling attribute breakout and event-handler injection. A low-privileged authenticated user must induce another user to open the crafted settings-page URL; exploitation runs script in that user's browser context.

The record

CVE
CVE-2021-24326
Published
May 17, 2021
Updated
Aug 3, 2024
Vendor
Clogica
Product
All 404 Redirect to Homepage
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=1.21 <1.21

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Clogica · All 404 Redirect to Homepageversion=1.21 <1.21

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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