CVE-2021-47920Public exploitNetwork attack vector

Session hijacking via reflected search parameters

Published Feb 1, 2026 · Updated Feb 1, 2026

Reflected XSS in WebMO Job Manager 20.0 allows remote attackers to run script in another user's browser through a crafted search URL. The jobmgr.cgi search form places filterSearch and filterSearchType GET values into its HTML response without neutralizing injected markup. Exploitation requires a victim to open the URL; the script runs in that user's session and enables session theft, phishing, or external redirects.

CVSS severity4.8
Medium
EPSS probability0.27%
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 WebMO Job Manager 20.0 allows remote attackers to run script in another user's browser through a crafted search URL. The jobmgr.cgi search form places filterSearch and filterSearchType GET values into its HTML response without neutralizing injected markup. Exploitation requires a victim to open the URL; the script runs in that user's session and enables session theft, phishing, or external redirects.

The record

CVE
CVE-2021-47920
Published
Feb 1, 2026
Updated
Feb 1, 2026
Vendor
WebMO
Product
WebMO
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 1, 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=20.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WebMO · WebMOversion=20.0

Published CVSS scores

4.8VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
5.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/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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