CVE-2026-3620

MEDIUM
Published Jun 2, 2026 Modified Jun 2, 2026 CWE-20

Description

The Word Replacer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'replacement' parameter in all versions up to, and including, 0.4. This is due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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CVSS v3.1 Score

4.4
MEDIUM
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0025
Probability of exploitation
0.16%
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-20 Improper Input Validation

References

Other References

https://plugins.trac.wordpress.org/browser/word-replacer/tags/0.4/word-replacer.php#L191 https://plugins.trac.wordpress.org/browser/word-replacer/tags/0.4/word-replacer.php#L230 https://plugins.trac.wordpress.org/browser/word-replacer/tags/0.4/word-replacer.php#L339 https://plugins.trac.wordpress.org/browser/word-replacer/tags/0.4/word-replacer.php#L343 https://plugins.trac.wordpress.org/browser/word-replacer/trunk/word-replacer.php#L191 https://plugins.trac.wordpress.org/browser/word-replacer/trunk/word-replacer.php#L230 https://plugins.trac.wordpress.org/browser/word-replacer/trunk/word-replacer.php#L339 https://plugins.trac.wordpress.org/browser/word-replacer/trunk/word-replacer.php#L343 https://www.wordfence.com/threat-intel/vulnerabilities/id/b827f0e1-b8ee-4015-a608-45505f43b324?source=cve

Frequently Asked Questions

What is CVE-2026-3620? +
The Word Replacer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'replacement' parameter in all versions up to, and including, 0.4. This is due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. It has a CVSS v3.1 base score of 4.4 (MEDIUM).
How severe is CVE-2026-3620? +
CVE-2026-3620 has a CVSS v3.1 score of 4.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0025, placing it in the 0th percentile for exploitation probability.
How do I check if I'm vulnerable to CVE-2026-3620? +
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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