CVE-2026-100175 json
Postie <= 1.9.87 - Unauthenticated Stored Cross-Site Scripting via Email Body URL Autolink
published 2026-10-28 12 d ago modified 2026-10-29 11 d ago also EUVD-2026-111751
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 26%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 11 d ago
Exploit prediction
0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N |
Affected products
- wayneallen-1 Postie
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/5b7d5d53-51a0-4d45-a180-0bde9edd8f4c?source=cve
- plugins.trac.wordpress.org /browser/postie/tags/1.9.87/lib/autolink.php#L220
- plugins.trac.wordpress.org /browser/postie/tags/1.9.87/lib/autolink.php#L136
- plugins.trac.wordpress.org /browser/postie/tags/1.9.87/lib/autolink.php#L129
- plugins.trac.wordpress.org /browser/postie/tags/1.9.87/postie-filters.php#L475
- plugins.trac.wordpress.org /browser/postie/tags/1.9.87/postie-message.php#L607
- plugins.trac.wordpress.org /browser/postie/tags/1.9.87/postie-message.php#L1311
- plugins.trac.wordpress.org /browser/postie/tags/1.9.87/postie.php#L241
- plugins.trac.wordpress.org /changeset/3751269
Sources
- CVE List CVE-2026-100175
- NVD CVE-2026-100175
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.