CVE-2020-36932Public exploitNetwork attack vector

Browser script execution via unneutralized checkuser setting

Published Jan 25, 2026 · Updated Jan 25, 2026

Stored XSS in SeaCMS 11.1 and earlier allows remote authenticated users to execute JavaScript in a user's browser via checkuser. The admin_safe.php settings handler stores the checkuser value and later renders it on the settings page without neutralizing HTML or script markup. Exploitation requires access to the administrative settings action and a user to load the affected page, exposing that user's session-accessible data and actions.

CVSS severity5.1
Medium
EPSS probability0.26%
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 SeaCMS 11.1 and earlier allows remote authenticated users to execute JavaScript in a user's browser via checkuser. The admin_safe.php settings handler stores the checkuser value and later renders it on the settings page without neutralizing HTML or script markup. Exploitation requires access to the administrative settings action and a user to load the affected page, exposing that user's session-accessible data and actions.

The record

CVE
CVE-2020-36932
Published
Jan 25, 2026
Updated
Jan 25, 2026
Vendor
SeaCMS
Product
SeaCMS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 25, 2026Record 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=0 <=11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SeaCMS · SeaCMSversion=0 <=11.1

Published CVSS scores

6.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/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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