CVE-2023-6875
High PUBLISHEDThe POST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress plugin for WordPress is vulnerable to...
Not yet in CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
The POST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress plugin for WordPress is vulnerable to unauthorized access of data and modification of data due to a type juggling issue on the connect-app REST endpoint in all versions up to, and including, 2.8.7. This makes it possible for unauthenticated attackers to reset the API key used to authenticate to the mailer and view logs, including password reset emails, allowing site takeover.
- CVE Published
- Jan 11, 2024
- Exploitation Reported
- Apr 25, 2025
- CVSS
- 9.8 Critical
- EPSS
- 90.3%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| wpexpertsio |
POST SMTP – The #1 WordPress SMTP Plugin with Advanced Email Logging and Delivery Failure Notifications
|
* to <= 2.8.7 |
Affected |
CVE References
- wordfence.com/threat-intel/vulnerabilities/id/e675d64c-cbb... wordfence.com · CVE Record https://www.wordfence.com/threat-intel/vulnerabilities/id/e675d64c-cb...
- plugins.trac.wordpress.org/browser/post-smtp/trunk/Postman/Mobile/inclu... plugins.trac.wordpress.org · CVE Record https://plugins.trac.wordpress.org/browser/post-smtp/trunk/Postman/Mo...
- plugins.trac.wordpress.org/changeset/3016051/post-smtp/trunk plugins.trac.wordpress.org · CVE Record https://plugins.trac.wordpress.org/changeset/3016051/post-smtp/trunk?...
- packetstormsecurity.com/files/176525/WordPress-POST-SMTP-Mailer-2.8.... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/176525/WordPress-POST-SMTP-Maile...
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| The Shadowserver First | 2026-06-04 00:00 UTC |
Scanner Artifacts
Nuclei and Metasploit references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-6875.yaml | Apr 25, 2025 |
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Status
Exploited in the wild
Recorded 2025-04-25 00:00:00 UTC · The Shadowserver
Proof of concept available
Recorded 2024-01-13 15:23:17 UTC · GitHub
Weaknesses (CWE)
-
Authorization Bypass Through User-Controlled Key
-
Missing Authorization
Scanner Integrations
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-6875.yaml | Apr 25, 2025 |
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2024-01-27 14:20:51 UTC · 6 stars
Exploit for CVE-2023-6875 - Unauthorized Account Takeover.
nuclei · Created Unknown
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC about 2 months ago00:00 UTC · about 2 months ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
00:00 UTC about 1 year ago00:00 UTC · about 1 year ago
Nuclei template available
Scanner coverage available
-
15:23 UTC over 2 years ago15:23 UTC · over 2 years ago
Public PoC available
Public proof-of-concept code published
-
08:33 UTC over 2 years ago08:33 UTC · over 2 years ago
CVE published
Vulnerability disclosed publicly
-
18:36 UTC over 2 years ago18:36 UTC · over 2 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2023-6875
{
"cve_id": "CVE-2023-6875",
"title": "The POST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mai...",
"affected_vendor": "wpexpertsio",
"affected_product": "POST SMTP – The #1 WordPress SMTP Plugin with Advanced Email Logging and Delivery Failure Notifications",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "High",
"cvss_score": 9.8,
"epss_score": 0.90339,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}