CVE-2021-24700Public exploitNetwork attack vector

Stored XSS via unescaped email-field labels

Published Nov 23, 2021 · Updated Aug 3, 2024

Stored XSS in WPMU DEV Forminator before 1.15.4 allows remote authenticated users to execute script in another administrator's browser. The email-field label is stored without sanitization or output escaping and rendered in the Behavior > Redirect URL admin tab. An administrator must save the crafted label, and another privileged user must open that tab, exposing the latter user's WordPress session data or actions.

CVSS severity4.8
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 WPMU DEV Forminator before 1.15.4 allows remote authenticated users to execute script in another administrator's browser. The email-field label is stored without sanitization or output escaping and rendered in the Behavior > Redirect URL admin tab. An administrator must save the crafted label, and another privileged user must open that tab, exposing the latter user's WordPress session data or actions.

The record

CVE
CVE-2021-24700
Published
Nov 23, 2021
Updated
Aug 3, 2024
Vendor
WPMU DEV
Product
Forminator
Classifications
CWE-79, T1203
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Nov 23, 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=1.15.4 <1.15.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

WPMU DEV · Forminatorversion=1.15.4 <1.15.4

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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