CVE-2021-24961Public exploitNetwork attack vector

Contributor-level stored XSS via unescaped shortcode arguments

Published Mar 7, 2022 · Updated Aug 3, 2024

Stored XSS in Iptanus File Upload and File Upload Pro before 4.16.3 allows remote authenticated users to inject script via shortcode arguments. The shortcode renderer inserts attacker-controlled widths and resetmode values into generated page markup without sufficient output escaping, allowing attribute breakout and script execution. Contributor access is sufficient to save the crafted shortcode, and execution occurs when another user previews or views the affected post.

CVSS severity5.4
Medium
EPSS probability0.67%
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 Iptanus File Upload and File Upload Pro before 4.16.3 allows remote authenticated users to inject script via shortcode arguments. The shortcode renderer inserts attacker-controlled widths and resetmode values into generated page markup without sufficient output escaping, allowing attribute breakout and script execution. Contributor access is sufficient to save the crafted shortcode, and execution occurs when another user previews or views the affected post.

The record

CVE
CVE-2021-24961
Published
Mar 7, 2022
Updated
Aug 3, 2024
Vendor
Iptanus
Product
Iptanus File Upload Pro
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 7, 2022CVE 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=4.16.3 <4.16.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Iptanus · Iptanus File Upload Proversion=4.16.3 <4.16.3
Iptanus · Iptanus File Uploadversion=4.16.3 <4.16.3

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')

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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