CVE-2020-23181Network attack vector

Authenticated reflected XSS via theme field

Published Jul 2, 2021 · Updated Aug 4, 2024

Cross-site scripting in PHP-Fusion 9.03.60 allows remote authenticated users to execute arbitrary web scripts or HTML via the Manage Theme field. The /administration/theme.php handler reflects the crafted Manage Theme value into an HTML response without context-appropriate output encoding. A remote authenticated user must submit the payload and induce a victim to load the resulting response; the consequence is script execution in the victim's browser with no reported service interruption.

CVSS severity5.4
Medium
EPSS probability0.45%
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 PHP-Fusion 9.03.60 allows remote authenticated users to execute arbitrary web scripts or HTML via the Manage Theme field. The /administration/theme.php handler reflects the crafted Manage Theme value into an HTML response without context-appropriate output encoding. A remote authenticated user must submit the payload and induce a victim to load the resulting response; the consequence is script execution in the victim's browser with no reported service interruption.

The record

CVE
CVE-2020-23181
Published
Jul 2, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 2, 2021CVE 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

3.5NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/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.

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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')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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