Postie <= 1.9.87 - Unauthenticated Stored Cross-Site Scripting via Email Body URL Autolink
Summary
| CVE | CVE-2026-100175 |
|---|---|
| State | PUBLISHED |
| Assigner | Wordfence |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-28 07:16:42 UTC |
| Updated | 2026-10-29 02:16:42 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v3.1 5.4 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
EPSS: 0.003320000 probability, percentile 0.263680000 (date 2026-10-28)
Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 5.4 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N |
| 3.1 | CNA | DECLARED | 5.4 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
NoneUser Interaction
NoneScope
ChangedConfidentiality
LowIntegrity
LowAvailability
NoneCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Wayneallen-1 | Postie | affected 1.9.87 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| www.wordfence.com/threat-intel/vulnerabilities/id/5b7d5d53-51a0-4d45-a180-0bde9... | [email protected] | www.wordfence.com | |
| plugins.trac.wordpress.org/browser/postie/tags/1.9.87/postie-message.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/postie/tags/1.9.87/lib/autolink.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/postie/tags/1.9.87/lib/autolink.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/postie/tags/1.9.87/lib/autolink.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/postie/tags/1.9.87/postie-filters.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/postie/tags/1.9.87/postie-message.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/postie/tags/1.9.87/postie.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/changeset/3751269 | [email protected] | plugins.trac.wordpress.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Wordfence PRISM (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-10-15T13:20:30.000Z | Vendor Notified |
| CNA | 2026-10-27T18:36:05.000Z | Disclosed |
There are currently no legacy QID mappings associated with this CVE.