CVE-2021-36920Network attack vector

Authenticated script execution via undisclosed reflected input

Published Jan 14, 2022 · Updated Apr 28, 2026

Reflected XSS in WPChill Download Monitor 4.4.6 and earlier allows remote authenticated users to run script via crafted requests. The public CNA record and vendor-linked references do not identify the affected parameter, handler, or missing output-encoding operation. A logged-in attacker must induce another user to open the crafted request, after which script executes in that user's browser under the site's origin.

CVSS severity5.4
Medium
EPSS probability0.57%
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 WPChill Download Monitor 4.4.6 and earlier allows remote authenticated users to run script via crafted requests. The public CNA record and vendor-linked references do not identify the affected parameter, handler, or missing output-encoding operation. A logged-in attacker must induce another user to open the crafted request, after which script executes in that user's browser under the site's origin.

The record

CVE
CVE-2021-36920
Published
Jan 14, 2022
Updated
Apr 28, 2026
Vendor
WPChill
Product
Download Monitor
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=<= 4.4.6 <=4.4.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WPChill · Download Monitorversion=<= 4.4.6 <=4.4.6

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
4.8PatchstackCVSS: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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