CVE-2026-100175: XSS (CVSS 5.4)

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.

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CVSS v3.1 Score

5.4

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0033

Probability of exploitation

0.26%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

References

Other References

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/lib/autolink.php#L136 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/postie-filters.php#L475 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-message.php#L607 https://plugins.trac.wordpress.org/browser/postie/tags/1.9.87/postie.php#L241 https://plugins.trac.wordpress.org/changeset/3751269 https://www.wordfence.com/threat-intel/vulnerabilities/id/5b7d5d53-51a0-4d45-a180-0bde9edd8f4c?source=cve

Frequently Asked Questions

What is CVE-2026-100175? +

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. It has a CVSS v3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2026-100175? +

CVE-2026-100175 has a CVSS v3.1 score of 5.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0033, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-100175? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-100175