CVE-2025-23509
Published: 22 January 2025
Summary
CVE-2025-23509 is a high-severity Cross-site Scripting (CWE-79) vulnerability. Its CVSS base score is 7.1 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 42.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-15 (Information Output Filtering).
Deeper analysis
CVE-2025-23509 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Reflected Cross-site Scripting (XSS) under CWE-79, affecting the siteheart HyperComments WordPress plugin (comments-with-hypercommentscom). This issue impacts all versions of HyperComments from n/a through 0.9.6.
The vulnerability has 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 network accessibility, low attack complexity, no required privileges, and user interaction. An unauthenticated attacker can exploit it by tricking a user into interacting with a maliciously crafted link or input that reflects an XSS payload, achieving low impacts on confidentiality, integrity, and availability with a changed scope.
The Patchstack advisory (https://patchstack.com/database/Wordpress/Plugin/comments-with-hypercommentscom/vulnerability/wordpress-hypercomments-plugin-0-9-6-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve) documents the Reflected XSS vulnerability in HyperComments plugin version 0.9.6 and provides details on mitigation strategies.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-3219
Vulnerability details
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in siteheart HyperComments comments-with-hypercommentscom allows Reflected XSS.This issue affects HyperComments: from n/a through <= 0.9.6.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Reflected XSS in public-facing WordPress plugin directly enables exploitation of the web application (T1190) and injection/execution of arbitrary JavaScript payloads via crafted links (T1059.007).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
SI-15 mandates information output filtering, directly preventing reflected XSS in HyperComments by encoding user inputs before rendering them in web pages.
SI-10 enforces input validation at entry points, neutralizing malicious XSS payloads in user-submitted comments to the HyperComments WordPress plugin.
SI-2 requires timely flaw remediation, addressing the specific XSS vulnerability in HyperComments versions through n/a to <=0.9.6 by applying patches.