CVE-2021-24732Public exploitNetwork attack vector

Stored script execution via unescaped shortcode class

Published Oct 18, 2021 · Updated Aug 3, 2024

Stored cross-site scripting in René Hermenau DearFlip before 1.7.10 allows remote authenticated users to execute script via a crafted shortcode. The shortcode renderer inserts the attacker-controlled class value into an HTML attribute without escaping, allowing attribute breakout and event-handler injection. Contributor access is sufficient to store the payload, and script executes in the site origin when another user views the affected content.

CVSS severity5.4
Medium
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in René Hermenau DearFlip before 1.7.10 allows remote authenticated users to execute script via a crafted shortcode. The shortcode renderer inserts the attacker-controlled class value into an HTML attribute without escaping, allowing attribute breakout and event-handler injection. Contributor access is sufficient to store the payload, and script executes in the site origin when another user views the affected content.

The record

CVE
CVE-2021-24732
Published
Oct 18, 2021
Updated
Aug 3, 2024
Vendor
René Hermenau
Product
DearFlip
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 18, 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=1.7.10 <1.7.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

René Hermenau · DearFlipversion=1.7.10 <1.7.10

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NVDAV: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
T1059.007JavaScript/JScript

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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