CVE-2021-20845: Cross-site request forgery (CSRF) vulnerability in Unlimited Sitemap Generator versions prior to v8.2 allows a

Q: How do I fix CVE-2021-20845?

unlimited sitemap generator: upgrade to 8.2. Exact commands for each OS are on this page.

Q: Is CVE-2021-20845 being exploited?

CVE-2021-20845 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-20845 affect?

CVE-2021-20845 affects unlimited sitemap generator. Severity is high (CVSS 8.8). Cross-site request forgery (CSRF) vulnerability in Unlimited Sitemap Generator versions prior to v8.2 allows a remote attacker to hijack the authentication of an administrator and conduct arbitrary operation via a specially crafted web page

This month

HIGH 8.8UPGRADE

CVE-2021-20845 is a high-severity flaw (CVSS 8.8) affecting unlimited sitemap generator. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site request forgery (CSRF) vulnerability in Unlimited Sitemap Generator versions prior to v8.2 allows a remote attacker to hijack the authentication of an administrator and conduct arbitrary operation via a specially crafted web page.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-352
Published	2021-11-24
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: xml-sitemaps

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-11-24 16:15 UTCPublished CVE record published
2026-06-17 03:34 UTCUpdated Record last modified

xml-sitemaps unlimited sitemap generator UPGRADE

Affected: < 8.2

Fixed in: 8.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy unlimited-sitemap-generator || rpm -q unlimited-sitemap-generator || unlimited-sitemap-generator --version

2. UPGRADE to 8.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade unlimited-sitemap-generator

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade unlimited-sitemap-generator

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-20845?

unlimited sitemap generator: upgrade to 8.2. Exact commands for each OS are on this page.

Is CVE-2021-20845 being exploited?

CVE-2021-20845 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-20845 affect?

CVE-2021-20845 affects unlimited sitemap generator. Severity is high (CVSS 8.8). Cross-site request forgery (CSRF) vulnerability in Unlimited Sitemap Generator versions prior to v8.2 allows a remote attacker to hijack the authentication of an administrator and conduct arbitrary operation via a specially crafted web page

How urgent is CVE-2021-20845?

Priority 42/100. High severity

References

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