How severe is CVE-2025-0521?

CVE-2025-0521 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-0521 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-0521?

CVE-2025-0521 affects Wpexperts Post Smtp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-0521?

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

Does CVE-2025-0521 have an EU (EUVD) identifier?

Yes. CVE-2025-0521 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-4802.

When was CVE-2025-0521 published?

CVE-2025-0521 was published on 2025-02-18 and last updated on 2026-06-17.

CVE-2025-0521

CVE-2025-0521 is a high-severity vulnerability in Wpexperts Post Smtp with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 3.x base score 7.2)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-4802
Weakness: CWE-79
Affected product: Wpexperts Post Smtp
Published: 2025-02-18
Last modified: 2026-06-17

Description

The Post SMTP plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the from and subject parameter in all versions up to, and including, 3.0.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Frequently asked questions

What is CVE-2025-0521?: The Post SMTP plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the from and subject parameter in all versions up to, and including, 3.0.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
How severe is CVE-2025-0521?: CVE-2025-0521 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-0521 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-0521?: CVE-2025-0521 affects Wpexperts Post Smtp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-0521?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-0521 have an EU (EUVD) identifier?: Yes. CVE-2025-0521 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-4802.
When was CVE-2025-0521 published?: CVE-2025-0521 was published on 2025-02-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:wpexperts:post_smtp:*:*:*:*:*:wordpress:*:*

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