CVE-2021-24559

Qyrr < 0.7 - Authenticated (contributor+) Stored XSS

Severity Score

5.4

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

El complemento Qyrr WordPress anterior a 0.7 no escapa del uri de datos del código QR cuando lo genera en un atributo src, lo que permite ataques de cross site scripting. Además, la acción data_uri_to_meta AJAX, disponible para todos los usuarios autenticados, solo tenía una verificación CSRF implementada, y el nonce disponible para usuarios con un rol tan bajo como Colaborador permite que cualquier usuario con dicho rol (y superior) establezca un dato malicioso. uri en publicaciones de códigos QR arbitrarios, lo que genera un problema de cross site scripting almacenado.

The Qyrr – simply and modern QR-Code creation plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘data-uri’ parameter in versions up to, and including, 0.7 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

*Credits: dc11, WPScan

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-01-14 CVE Reserved
2021-07-26 CVE Published
2024-01-24 EPSS Updated
2024-08-03 CVE Updated
2024-08-03 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC
https://wpscan.com/vulnerability/65a29976-163a-4bbf-a4e8-590ddc4b83f2	2024-08-03

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Patrickposner Search vendor "Patrickposner"		Qyrr Search vendor "Patrickposner" for product "Qyrr"				< 0.7 Search vendor "Patrickposner" for product "Qyrr" and version " < 0.7"		wordpress		Affected