CVE-2021-24854Public exploitNetwork attack vector

Contributor-level script execution via unescaped redirect fields

Published Nov 17, 2021 · Updated Aug 3, 2024

Stored XSS in Nikki Blight QR Redirector before 1.6.1 allows remote authenticated users to execute script in a viewer's browser. The plugin stores unsanitized content from the redirect URL and admin-notes fields and later emits it into HTML without context-appropriate escaping. Contributor access is sufficient to save the payload, and execution requires another user, including an administrator reviewing the redirect, to view the affected content.

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

Stored XSS in Nikki Blight QR Redirector before 1.6.1 allows remote authenticated users to execute script in a viewer's browser. The plugin stores unsanitized content from the redirect URL and admin-notes fields and later emits it into HTML without context-appropriate escaping. Contributor access is sufficient to save the payload, and execution requires another user, including an administrator reviewing the redirect, to view the affected content.

The record

CVE
CVE-2021-24854
Published
Nov 17, 2021
Updated
Aug 3, 2024
Vendor
Nikki Blight
Product
QR Redirector
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 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=1.6.1 <1.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nikki Blight · QR Redirectorversion=1.6.1 <1.6.1

Published CVSS scores

3.5NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/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 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-79Cross-site Scripting (XSS)
CAPEC-592Stored XSS
T1059.007Command and Scripting Interpreter JavaScript

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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