CVE-2020-22533Public exploitNetwork attack vector

Reflected XSS via unsanitized lang parameter

Published Apr 4, 2023 · Updated Feb 13, 2025

Reflected XSS in EasyCorp ZenTao allows remote attackers to execute JavaScript in a user's browser through a crafted lang parameter. The index.php endpoint reflects the lang query value into a page without neutralizing script markup, as demonstrated by a script-bearing URL; the precise server-side function is undisclosed. Successful exploitation requires a user to open the crafted URL and permits browser-context data access or actions under that user's ZenTao session.

CVSS severity6.1
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in EasyCorp ZenTao allows remote attackers to execute JavaScript in a user's browser through a crafted lang parameter. The index.php endpoint reflects the lang query value into a page without neutralizing script markup, as demonstrated by a script-bearing URL; the precise server-side function is undisclosed. Successful exploitation requires a user to open the crafted URL and permits browser-context data access or actions under that user's ZenTao session.

The record

CVE
CVE-2020-22533
Published
Apr 4, 2023
Updated
Feb 13, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record 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

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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.

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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

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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