CVE-2020-28707

Name: CVE-2020-28707
Creator: NVD / NIST
Published: 2021-01-19T22:15:12.537+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.36%

Last modified Jun 17, 2026

CVE-2020-28707 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. The Stockdio Historical Chart plugin before 2.8.1 for WordPress is affected by Cross Site Scripting (XSS) via stockdio_chart_historical-wp.js in wp-content/plugins/stockdio-historical-chart/assets/ because the origin of a postMessage() event is not validated. The stockdio_eventer function listens for any postMessage event. EPSS estimates a 1.36% chance of exploitation in the next 30 days.

Description

The Stockdio Historical Chart plugin before 2.8.1 for WordPress is affected by Cross Site Scripting (XSS) via stockdio_chart_historical-wp.js in wp-content/plugins/stockdio-historical-chart/assets/ because the origin of a postMessage() event is not validated. The stockdio_eventer function listens for any postMessage event. After a message event is sent to the application, this function sets the "e" variable as the event and checks that the types of the data and data.method are not undefined (empty) before proceeding to eval the data.method received from the postMessage. However, on a different website. JavaScript code can call window.open for the vulnerable WordPress instance and do a postMessage(msg,'*') for that object.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

1.36%

68.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Stockdio	Stockdio Historical Chart	< 2.8.1

References

http://stockdio.comVendor Advisory
https://jondow.eu/cve-2020-28707-xss-in-stockdio-historical-chart-plugin-for-wordpress-before-version-281/Exploit, Third Party Advisory
https://wordpress.org/plugins/stockdio-historical-chart/#developersRelease Notes, Third Party Advisory
http://stockdio.comVendor Advisory
https://jondow.eu/cve-2020-28707-xss-in-stockdio-historical-chart-plugin-for-wordpress-before-version-281/Exploit, Third Party Advisory
https://wordpress.org/plugins/stockdio-historical-chart/#developersRelease Notes, Third Party Advisory

Timeline

Published: Jan 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-28707?

How severe is CVE-2020-28707?

CVE-2020-28707 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.36% probability of exploitation in the next 30 days.

How do I fix CVE-2020-28707?

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-2020-28707?

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

Scan your code now

Source: NVD / NIST