CVE-2021-24559

Public Exploit
Qyrr < 0.7 - Authenticated (contributor+) Stored XSS

Description

The Qyrr WordPress plugin before 0.7 does not escape the data-uri of the QR Code when outputting it in a src attribute, allowing for Cross-Site Scripting attacks. Furthermore, the data_uri_to_meta AJAX action, available to all authenticated users, only had a CSRF check in place, with the nonce available to users with a role as low as Contributor allowing any user with such role (and above) to set a malicious data-uri in arbitrary QR Code posts, leading to a Stored Cross-Site Scripting issue.

Category

5.4
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.29%
Third-Party Advisory wpscan.com
Affected: Unknown Qyrr
Published at:
Updated at:

References

Link Tags
https://wpscan.com/vulnerability/65a29976-163a-4bbf-a4e8-590ddc4b83f2/ third party advisory vdb entry exploit technical description

Frequently Asked Questions

What is the severity of CVE-2021-24559?
CVE-2021-24559 has been scored as a medium severity vulnerability.
How to fix CVE-2021-24559?
To fix CVE-2021-24559, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-24559 being actively exploited in the wild?
It is possible that CVE-2021-24559 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-24559?
CVE-2021-24559 affects Unknown Qyrr.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.