CVE-2021-34634: The Nifty Newsletters WordPress plugin is vulnerable to Cross-Site Request Forgery via the sola_nl_wp_head fun

Q: How do I fix CVE-2021-34634?

sola-newsletters: upgrade to newer than 4.0.23. Exact commands for each OS are on this page.

Q: Is CVE-2021-34634 being exploited?

CVE-2021-34634 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-2021-34634 affect?

CVE-2021-34634 affects sola-newsletters. Severity is high (CVSS 8.8). The Nifty Newsletters WordPress plugin is vulnerable to Cross-Site Request Forgery via the sola_nl_wp_head function found in the ~/sola-newsletters.php file which allows attackers to inject arbitrary web scripts, in versions up to and inclu

Q: How urgent is CVE-2021-34634?

Priority 49/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2021-34634 is a high-severity flaw (CVSS 8.8) affecting sola-newsletters. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Nifty Newsletters WordPress plugin is vulnerable to Cross-Site Request Forgery via the sola_nl_wp_head function found in the ~/sola-newsletters.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 4.0.23.

Why this priority

High severity
Public exploit reference

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	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-352
Published	2021-08-05
Last modified	2026-06-17

Publisher (CNA): Wordfence · Vendor: sola-newsletters project

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

Am I affected?

Timeline

2021-08-05 21:15 UTCPublished CVE record published
2026-06-17 03:56 UTCUpdated Record last modified

sola-newsletters project sola-newsletters UPGRADE

Affected: <= 4.0.23

Fixed in: newer than 4.0.23

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy sola-newsletters || rpm -q sola-newsletters || sola-newsletters --version

2. UPGRADE to newer than 4.0.23 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sola-newsletters

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sola-newsletters

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-2021-34634?

sola-newsletters: upgrade to newer than 4.0.23. Exact commands for each OS are on this page.

Is CVE-2021-34634 being exploited?

CVE-2021-34634 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-2021-34634 affect?

CVE-2021-34634 affects sola-newsletters. Severity is high (CVSS 8.8). The Nifty Newsletters WordPress plugin is vulnerable to Cross-Site Request Forgery via the sola_nl_wp_head function found in the ~/sola-newsletters.php file which allows attackers to inject arbitrary web scripts, in versions up to and inclu

How urgent is CVE-2021-34634?

Priority 49/100. High severity; Public exploit reference

Software pages

WordPress vulnerabilities · PHP vulnerabilities

References

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