CVE-2021-20845Network attack vector

Administrator action hijacking via crafted web page

Published Nov 24, 2021 · Updated Aug 3, 2024

Cross-site request forgery in XML-Sitemaps Unlimited Sitemap Generator before 8.2 allows remote attackers to perform administrator actions. A malicious page causes the logged-in administrator's browser to submit an unintended request, but public sources do not identify the endpoint or missing request-validation control. Exploitation requires an administrator to remain authenticated and view attacker-controlled content; the resulting operation is otherwise unspecified.

CVSS severity4.3
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in XML-Sitemaps Unlimited Sitemap Generator before 8.2 allows remote attackers to perform administrator actions. A malicious page causes the logged-in administrator's browser to submit an unintended request, but public sources do not identify the endpoint or missing request-validation control. Exploitation requires an administrator to remain authenticated and view attacker-controlled content; the resulting operation is otherwise unspecified.

The record

CVE
CVE-2021-20845
Published
Nov 24, 2021
Updated
Aug 3, 2024
Vendor
XML-Sitemaps
Product
Unlimited Sitemap Generator
Classifications
CWE-352, CAPEC-62
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 24, 2021CVE 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=versions prior to v8.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

XML-Sitemaps · Unlimited Sitemap Generatorversion=versions prior to v8.2

Published CVSS scores

2.6JPCERT/CCAV:N/AC:H/Au:N/C:N/I:P/A:N
4.3JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
CAPEC-62Cross Site Request Forgery

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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