CVE-2026-75962
Post SMTP <= 4.0.1 - Unauthenticated Stored DOM-Based Cross-Site Scripting via 'user_email' Parameter (Multisite Registration → Failed Email Log)
- Published
- Updated
- Reserved
- Assigned by
- Wordfence
Description
The Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'user_email' parameter in all versions up to, and including, 4.0.1 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. This is exploitable without authentication on WordPress Multisite installations with public registration enabled, as WordPress accepts email addresses containing numeric HTML character references that Post SMTP's stricter validator rejects, persisting the attacker-controlled address verbatim to the email log via the failed-send exception message.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| WordfenceCNA (assigner) | 3.1 | High7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
| NVDNVD · Deferred | 3.1 | High7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.28% · top 80% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.2.
Weakness
Affected products
References (8)
- https://www.wordfence.com/threat-intel/vulnerabilities/id/accac3da-0318-4e79-a163-ed9ff2af692b?source=cve (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/post-smtp/tags/3.9.5/Postman/PostmanWpMail.php#L374 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/post-smtp/tags/3.9.5/script/postman-email-logs.js#L711 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/post-smtp/tags/3.9.5/Postman/PostmanEmailLogs.php#L538 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/post-smtp/tags/3.9.5/Postman/Postman-Email-Log/PostmanEmailLogService.php#L215 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/post-smtp/tags/3.9.5/Postman/Postman-Mail/PostmanEmailAddress.php#L63 (opens in a new tab)
- https://plugins.trac.wordpress.org/changeset?reponame=&new=3711079%40post-smtp%2Ftags%2F4.0.2&old=3664536%40post-smtp%2Ftags%2F4.0.1 (opens in a new tab)
- https://plugins.trac.wordpress.org/changeset/3711068/post-smtp/trunk/Postman/Postman-Email-Log/PostmanEmailLogService.php (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-75962)Record last updated .