CVE-2020-36828Network attack vector

Cross-site scripting via unescaped uchidden parameter

Published Mar 31, 2024 · Updated Aug 4, 2024

Cross-site scripting in Discuz! X 3.4-20200818 allows remote authenticated users to inject script through the installer. The show_next_step function places the global uchidden value into generated installer markup without HTML escaping. A low-privilege account and victim interaction are required; the documented impact is confined to injected content in the victim's browser.

CVSS severity3.5
Low
EPSS probability0.48%
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 Discuz! X 3.4-20200818 allows remote authenticated users to inject script through the installer. The show_next_step function places the global uchidden value into generated installer markup without HTML escaping. A low-privilege account and victim interaction are required; the documented impact is confined to injected content in the victim's browser.

The record

CVE
CVE-2020-36828
Published
Mar 31, 2024
Updated
Aug 4, 2024
Vendor
Comsenz
Product
Discuz! X
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 31, 2024CVE 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.4-20200818

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Comsenz · Discuz! Xversion=3.4-20200818

Published CVSS scores

3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A:N
3.5VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/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')
T1203Exploitation for Client Execution

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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