CVE-2019-16520

Name: CVE-2019-16520
Creator: NVD / NIST
Published: 2019-10-16T14:15:13.777+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 1.53%

Last modified Jun 17, 2026

CVE-2019-16520 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. The all-in-one-seo-pack plugin before 3.2.7 for WordPress (aka All in One SEO Pack) is susceptible to Stored XSS due to improper encoding of the SEO-specific description for posts provided by the plugin via unsafe placeholder replacement.. EPSS estimates a 1.53% chance of exploitation in the next 30 days.

Description

The all-in-one-seo-pack plugin before 3.2.7 for WordPress (aka All in One SEO Pack) is susceptible to Stored XSS due to improper encoding of the SEO-specific description for posts provided by the plugin via unsafe placeholder replacement.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

1.53%

71.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Semperplugins	All In One Seo Pack	< 3.2.7

References

http://www.openwall.com/lists/oss-security/2019/10/16/5Exploit, Mailing List, Third Party Advisory
https://github.com/sbaresearch/advisories/tree/public/2019/SBA-ADV-20190913-04_WordPress_Plugin_All_in_One_SEO_PackExploit, Third Party Advisory
https://github.com/semperfiwebdesign/all-in-one-seo-pack/issues/2888Patch, Third Party Advisory
https://semperplugins.com/all-in-one-seo-pack-changelog/Release Notes, Vendor Advisory
https://wordpress.org/plugins/all-in-one-seo-pack/#developersProduct, Third Party Advisory
https://wpvulndb.com/vulnerabilities/9915Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/10/16/5Exploit, Mailing List, Third Party Advisory
https://github.com/sbaresearch/advisories/tree/public/2019/SBA-ADV-20190913-04_WordPress_Plugin_All_in_One_SEO_PackExploit, Third Party Advisory
https://github.com/semperfiwebdesign/all-in-one-seo-pack/issues/2888Patch, Third Party Advisory
https://semperplugins.com/all-in-one-seo-pack-changelog/Release Notes, Vendor Advisory
https://wordpress.org/plugins/all-in-one-seo-pack/#developersProduct, Third Party Advisory
https://wpvulndb.com/vulnerabilities/9915Third Party Advisory

Timeline

Published: Oct 16, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-16520?

How severe is CVE-2019-16520?

CVE-2019-16520 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 1.53% probability of exploitation in the next 30 days.

How do I fix CVE-2019-16520?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-16520?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST