CVE-2021-4035Network attack vector

Authenticated browser code execution via unsanitized report comments

Published Feb 11, 2022 · Updated Sep 16, 2024

Stored XSS in WOCU-Monitoring before 48.2 allows remote authenticated users to execute JavaScript through report comments. The Reports module passes saved rich-text attributes to TinyMCE setContent without adequate validation or restrictive server-side sanitization. An account able to view and edit reports is required, and a report viewer must open the stored comment for code to run in that viewer's browser.

CVSS severity3.5
Low
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

Stored XSS in WOCU-Monitoring before 48.2 allows remote authenticated users to execute JavaScript through report comments. The Reports module passes saved rich-text attributes to TinyMCE setContent without adequate validation or restrictive server-side sanitization. An account able to view and edit reports is required, and a report viewer must open the stored comment for code to run in that viewer's browser.

The record

CVE
CVE-2021-4035
Published
Feb 11, 2022
Updated
Sep 16, 2024
Vendor
A3Sec
Product
WOCU-Monitoring
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=0.27 <48.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

A3Sec · WOCU-Monitoringversion=0.27 <48.2

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
3.5INCIBECVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/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
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.

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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