CVE-2025-23606 is a high-severity vulnerability affecting the Calendi plugin for WordPress. This vulnerability allows improper neutralization of input during web page generation, specifically resulting in reflected Cross-site Scripting (XSS). The issue impacts versions of Calendi from n/a through version 1.1.1. With a CVSS score of 7.1, this vulnerability is categorized as high severity, indicating significant risk to organizations that utilize this plugin.
Risk to organizations includes potential unauthorized actions on behalf of users, which can lead to data theft and compromised user accounts. Given the low attack complexity and the requirement for user interaction, attackers may leverage social engineering tactics to exploit this vulnerability. Organizations should prioritize patching immediately.
As of now, there is no confirmed public exploit for CVE-2025-23606, but the nature of XSS vulnerabilities means that the risk of exploitation remains high, especially if the vulnerability is not addressed promptly. Therefore, it is crucial for those using affected versions to take immediate action to mitigate potential risks.
Organizations should address this vulnerability in their priority patch cycle to ensure the security of their web applications and user data.
Vulnerability Details
The official description of this vulnerability states: 'Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in sebkay Calendi calendi allows Reflected XSS. This issue affects Calendi: from n/a through <= 1.1.1.' This vulnerability is classified under CWE-79, indicating the nature of the flaw as a Cross-site Scripting issue.
The CVSS score assigned to this vulnerability is 7.1, placing it in the high severity range. The attack vector is network-based, and the attack complexity is low, suggesting that exploitation may be straightforward for attackers. The vulnerability requires no special privileges to exploit, but user interaction is necessary, highlighting the potential for social engineering attacks.
Organizations using the Calendi plugin should ensure they are aware of this vulnerability and the specific versions affected. The vulnerability was published on January 22, 2025, and was last modified on April 23, 2026.
Technical Analysis
The root cause of CVE-2025-23606 is improper input handling during the web page generation process. This failure allows attackers to inject malicious scripts that can be executed in the context of users' browsers, leading to unauthorized actions and data exposure. The attack vector is primarily network-based, as attackers can exploit this vulnerability through web requests.
The attack complexity is low, meaning that an attacker does not require advanced skills to exploit this vulnerability. Additionally, no privileges are needed to perform the attack, further increasing the risk. User interaction is necessary, as victims must click on crafted links or visit malicious pages to trigger the XSS payload.
The confidentiality, integrity, and availability impacts are all classified as low, indicating that while the vulnerability may not compromise the entire system, it can still lead to significant issues for affected users.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2025-23606 is considerable, particularly given the widespread use of the Calendi plugin in various WordPress installations. Attackers may exploit this vulnerability to perform unauthorized actions on behalf of users, potentially leading to data theft, account compromise, and a loss of trust in affected organizations.
This vulnerability's blast radius could extend to any user interacting with the affected plugin, highlighting the need for immediate remediation. Organizations should assess the urgency of addressing this vulnerability based on the CVSS score and the potential for exploitation.
Given that the vulnerability is not currently listed in the Known Exploited Vulnerabilities (KEV) catalog, there is still a window of opportunity for organizations to mitigate its risks before it becomes widely exploited.
Organizations should prioritize the remediation of this vulnerability based on its high CVSS score and the potential impact on their operations.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of the Calendi plugin prior to version 1.1.1 are affected by this vulnerability. Organizations should ensure they are on the latest version to mitigate the risks associated with this flaw.
Mitigation & Remediation
Organizations should apply the following measures to mitigate the risks associated with CVE-2025-23606:
1. Update the Calendi plugin to the latest version that addresses this vulnerability.
2. Implement input validation and sanitization measures to prevent malicious scripts from being executed.
3. Educate users about the risks of clicking on untrusted links and the importance of verifying URLs.
Organizations should validate remediation through penetration testing to identify similar weaknesses.
Detection Guidance
Organizations should monitor their systems for the following indicators to detect potential exploitation of this vulnerability:
1. Logs showing attempts to inject scripts via input fields.
2. Unusual user behavior that may indicate an account compromise.
3. Alerts for unauthorized changes to web pages or user data.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-23606 lies in its illustration of common vulnerabilities present in web applications, particularly those that fail to implement adequate input validation mechanisms. This vulnerability represents a trend where attackers exploit XSS flaws to conduct further attacks on users.
Security teams should take this incident as a reminder to consistently review and strengthen their application security measures. Regular security assessments, such as penetration testing methodology, can help identify vulnerabilities before they are exploited.
Moreover, organizations should stay informed about evolving threats and trends in the cybersecurity landscape to proactively adjust their defenses. Utilizing resources like the vulnerability management program design can enhance their resilience against future vulnerabilities.
Finally, an emphasis on ongoing security training for developers and staff is paramount to ensure that security considerations are integrated into the software development lifecycle.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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