How severe is CVE-2021-34621?

CVE-2021-34621 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-34621 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 69% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34621?

CVE-2021-34621 affects Properfraction Profilepress. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-34621?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-34621 published?

CVE-2021-34621 was published on 2021-07-07 and last updated on 2026-06-17.

CVE-2021-34621

CVE-2021-34621 is a critical-severity vulnerability in Properfraction Profilepress with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 69% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-306.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 69% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-306
Affected product: Properfraction Profilepress
Published: 2021-07-07
Last modified: 2026-06-17

Description

A vulnerability in the user registration component found in the ~/src/Classes/RegistrationAuth.php file of the ProfilePress WordPress plugin made it possible for users to register on sites as an administrator. This issue affects versions 3.0.0 - 3.1.3. .

Frequently asked questions

What is CVE-2021-34621?: A vulnerability in the user registration component found in the ~/src/Classes/RegistrationAuth.php file of the ProfilePress WordPress plugin made it possible for users to register on sites as an administrator. This issue affects versions 3.0.0 - 3.1.3. .
How severe is CVE-2021-34621?: CVE-2021-34621 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-34621 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 69% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34621?: CVE-2021-34621 affects Properfraction Profilepress. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-34621?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-34621 published?: CVE-2021-34621 was published on 2021-07-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:properfraction:profilepress:*:*:*:*:*:wordpress:*:*

More vulnerabilities in Properfraction Profilepress

CVE-2021-34624 — Critical (CVSS 9.8): A vulnerability in the file uploader component found in the ~/src/Classes/FileUploader.php file of the ProfilePress…
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CVE-2021-34622 — Critical (CVSS 9.8): A vulnerability in the user profile update component found in the ~/src/Classes/EditUserProfile.php file of the…
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CVE-2023-44150 — High (CVSS 7.5): Exposure of Sensitive Information to an Unauthorized Actor vulnerability in ProfilePress Membership Team Paid…

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