CVE-2020-13761Network attack vector

Cross-site scripting via unvalidated heading tag

Published Jun 2, 2020 · Updated Aug 4, 2024

Cross-site scripting in Joomla! 3.0.0 through 3.9.18 allows remote attackers to execute script in a victim browser via module heading tags. The Articles - Newsflash and Articles - Categories modules accept heading-tag option input without validation, allowing attacker-controlled markup to reach generated pages. A victim must load the affected page for script execution; the documented impact is browser-side confidentiality and integrity loss without service interruption.

CVSS severity6.1
Medium
EPSS probability0.99%
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 Joomla! 3.0.0 through 3.9.18 allows remote attackers to execute script in a victim browser via module heading tags. The Articles - Newsflash and Articles - Categories modules accept heading-tag option input without validation, allowing attacker-controlled markup to reach generated pages. A victim must load the affected page for script execution; the documented impact is browser-side confidentiality and integrity loss without service interruption.

The record

CVE
CVE-2020-13761
Published
Jun 2, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 2, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NVDAV:N/AC:M/Au:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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