CVE-2021-41951Public exploitNetwork attack vector

Browser script execution via unencoded reflected parameter

Published Nov 15, 2021 · Updated Aug 4, 2024

Reflected XSS in ResourceSpace before 9.6 rev 18290 allows remote attackers to run JavaScript in a victim's browser via a crafted URL. The WordPress SSO plugin's plugins/wordpress_sso/pages/index.php echoes the wordpress_user parameter into the response without output encoding. Exploitation requires a ResourceSpace user to follow the attacker-supplied link; script execution remains within the victim's browser context.

CVSS severity6.1
Medium
EPSS probability77.89%
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 ResourceSpace before 9.6 rev 18290 allows remote attackers to run JavaScript in a victim's browser via a crafted URL. The WordPress SSO plugin's plugins/wordpress_sso/pages/index.php echoes the wordpress_user parameter into the response without output encoding. Exploitation requires a ResourceSpace user to follow the attacker-supplied link; script execution remains within the victim's browser context.

The record

CVE
CVE-2021-41951
Published
Nov 15, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 15, 2021CVE 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?

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

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS: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')
T1203Exploitation for Client Execution

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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