PatchTheCVECVE-2025-0521: The Post SMTP plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the from and subject param
CVE-2025-0521 is a high-severity flaw (CVSS 7.2) affecting post smtp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.2 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 75%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2025-02-18 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
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-2025-0521?
post smtp: upgrade to 3.1.0. Exact commands for each OS are on this page.
Is CVE-2025-0521 being exploited?
CVE-2025-0521 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-2025-0521 affect?
CVE-2025-0521 affects post smtp. Severity is high (CVSS 7.2). 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 possibl
How urgent is CVE-2025-0521?
Priority 37/100. High severity; Remotely exploitable, no login, no user action
Software pages
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