CVE-2021-25088Public exploitNetwork attack vector

Administrator-level stored XSS via unescaped memory-limit setting

Published Jun 20, 2022 · Updated Aug 3, 2024

Stored XSS in XML Sitemap Generator for Google before 4.1.3 allows remote authenticated users to inject scripts through a plugin setting. The Debug page renders the stored “Try to increase the memory limit to” setting without sanitization or output escaping, causing its script content to execute when the page is opened. Administrative privileges are required, and exploitation applies when unfiltered_html is disabled, including in multisite installations; execution occurs in the browser of a user who opens the poisoned Debug page.

CVSS severity4.8
Medium
EPSS probability0.59%
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 XML Sitemap Generator for Google before 4.1.3 allows remote authenticated users to inject scripts through a plugin setting. The Debug page renders the stored “Try to increase the memory limit to” setting without sanitization or output escaping, causing its script content to execute when the page is opened. Administrative privileges are required, and exploitation applies when unfiltered_html is disabled, including in multisite installations; execution occurs in the browser of a user who opens the poisoned Debug page.

The record

CVE
CVE-2021-25088
Published
Jun 20, 2022
Updated
Aug 3, 2024
Vendor
XmlSitemapGenerator.org
Product
XML Sitemap Generator for Google
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jun 20, 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

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=4.1.3 <4.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

XmlSitemapGenerator.org · XML Sitemap Generator for Googleversion=4.1.3 <4.1.3

Published CVSS scores

3.5NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
4.8NVDCVSS: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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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