Stored cross-site scripting in Postie plugin for WordPress
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
The Postie plugin for WordPress through 1.9.87 does not sanitize or escape URL autolinks in email bodies, which is stored cross-site scripting (CWE-79). An unauthenticated attacker can store scripts in pages that run when a user opens the injected page. The ?postie=get-mail endpoint has no capability check, and the email processing path removes WordPress kses output filters before saving raw markup.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
Description from the CNA
The Postie plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Email Body URL Autolink in all versions up to, and including, 1.9.87 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 possible because the ?postie=get-mail endpoint is reachable by unauthenticated users with no capability check, and the email processing path removes WordPress's kses output filters before saving raw markup, allowing the unescaped href attribute value to be stored as post content.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| wayneallen-1 | Postie | up to 1.9.87 | — | No fix listed | CNA |
- Postie Vendorwayneallen-1 Affected up to 1.9.87 Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for Postie.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
Timeline
- 2026-10-28 Threatist record created from CVE-2026-100175
- 2026-10-28 Alias added: GHSA-37r8-fq3j-qq4r
- 2026-10-28 Priority changed: MEDIUM → LOW
- 2026-10-29 CISA SSVC decision points changed
References
Other 9
- https://www.wordfence.com/threat-intel/vulnerabilities/id/5b7d5d53-51a0-4d45-a180-0bde9edd8f4c?source=cve
- https://plugins.trac.wordpress.org/browser/postie/tags/1.9.87/lib/autolink.php#L220
- https://plugins.trac.wordpress.org/browser/postie/tags/1.9.87/lib/autolink.php#L136
- https://plugins.trac.wordpress.org/browser/postie/tags/1.9.87/lib/autolink.php#L129
- https://plugins.trac.wordpress.org/browser/postie/tags/1.9.87/postie-filters.php#L475
- https://plugins.trac.wordpress.org/browser/postie/tags/1.9.87/postie-message.php#L607
- https://plugins.trac.wordpress.org/browser/postie/tags/1.9.87/postie-message.php#L1311
- https://plugins.trac.wordpress.org/browser/postie/tags/1.9.87/postie.php#L241
- https://plugins.trac.wordpress.org/changeset/3751269
Sources
- CVE-2026-100175 · CVE Program
- CVE-2026-100175 · NVD
- FIRST EPSS
- GHSA-37r8-fq3j-qq4r · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences