CVE-2021-25100Network attack vector

Reflected XSS via unescaped dashboard search

Published Feb 21, 2022 · Updated Aug 3, 2024

Reflected XSS in the Donation Forms dashboard in Nexcess GiveWP before 2.17.3 allows remote attackers to execute script via a crafted URL. The dashboard inserts the s query parameter into an HTML attribute without escaping it, allowing the supplied value to break out into executable markup. Exploitation requires an authenticated dashboard user to follow the attacker-controlled URL, and the script runs in that user's browser context.

CVSS severity6.1
Medium
EPSS probability0.87%
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 the Donation Forms dashboard in Nexcess GiveWP before 2.17.3 allows remote attackers to execute script via a crafted URL. The dashboard inserts the s query parameter into an HTML attribute without escaping it, allowing the supplied value to break out into executable markup. Exploitation requires an authenticated dashboard user to follow the attacker-controlled URL, and the script runs in that user's browser context.

The record

CVE
CVE-2021-25100
Published
Feb 21, 2022
Updated
Aug 3, 2024
Vendor
Nexcess
Product
GiveWP
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 21, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=2.17.3 <2.17.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nexcess · GiveWPversion=2.17.3 <2.17.3

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 exploitUnconfirmed

Weakness, pattern, technique

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

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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