CVE-2024-13891
Published: 13 March 2025
Summary
CVE-2024-13891 is a high-severity Cross-site Scripting (CWE-79) vulnerability in Scheduler Schedule. Its CVSS base score is 7.1 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Malicious Link (T1204.001); ranked at the 33.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-15 (Information Output Filtering).
Deeper analysis
CVE-2024-13891 is a reflected cross-site scripting (XSS) vulnerability, classified under CWE-79, affecting the Schedule WordPress plugin in versions through 1.0.0. The plugin fails to sanitize and escape a parameter before outputting it back in the page, enabling malicious script injection. It carries a CVSS v3.1 base score of 7.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L), indicating high severity due to network accessibility and scope change.
An unauthenticated attacker can exploit this vulnerability remotely by tricking a targeted user, such as a high-privilege administrator, into interacting with a maliciously crafted link or input. Successful exploitation executes arbitrary JavaScript in the victim's browser context, potentially allowing session hijacking, data theft, or further site compromise, with low impacts on confidentiality, integrity, and availability.
Mitigation details are available in the WPScan advisory at https://wpscan.com/vulnerability/58c8b73c-3a29-4a66-9b2e-f24b5c2769ac/.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-54081
Vulnerability details
The Schedule WordPress plugin through 1.0.0 does not sanitise and escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Reflected XSS enables arbitrary JavaScript execution in browser via malicious crafted link, directly mapping to user execution through malicious link and JavaScript scripting.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly addresses the failure to escape output parameters, preventing reflected XSS script injection in web pages.
Requires validation of unsanitized input parameters to block malicious script payloads before reflection.
Ensures timely remediation of flaws like this plugin's XSS vulnerability through identification, reporting, and patching.