XSS in Patrickposner Qyrr
CVE-2021-24559
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.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.002 (12.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Patrickposner Qyrr
- Unknown Qyrr — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- contact@wpscan.com (Exploit, technical-description, Third Party Advisory, exploit, vdb-entry)
Frequently asked questions
- What is CVE-2021-24559?
- CVE-2021-24559 is a medium-severity vulnerability in Patrickposner Qyrr, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2024-01-16.
- How severe is CVE-2021-24559?
- Medium severity. CVSS v3 base score is 5.4 out of 10.
- Is CVE-2021-24559 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.