CVE-2021-31778Network attack vector

Script execution via unrestricted iframe URL scheme

Published Apr 28, 2021 · Updated Aug 3, 2024

Cross-site scripting in media2click 1.0.0 through 1.3.2 allows remote authenticated users to execute script via a crafted iframe URL. The iframe source field in tt_content accepted any trimmed, nonempty value and rendered it in HTML without restricting the URL scheme to HTTP or HTTPS. A TYPO3 backend account is required to save the payload, which executes when the affected embedded content is rendered in a browser.

CVSS severity6.4
Medium
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in media2click 1.0.0 through 1.3.2 allows remote authenticated users to execute script via a crafted iframe URL. The iframe source field in tt_content accepted any trimmed, nonempty value and rendered it in HTML without restricting the URL scheme to HTTP or HTTPS. A TYPO3 backend account is required to save the payload, which executes when the affected embedded content is rendered in a browser.

The record

CVE
CVE-2021-31778
Published
Apr 28, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 28, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.4GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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.

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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 exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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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