The vulnerability identified as CVE-2025-23959 is classified as a high-severity Cross-site Scripting (XSS) issue within the Linus Lundahl Good Old Gallery plugin. This vulnerability allows for improper neutralization of input during web page generation, leading to reflected XSS attacks. It affects versions of Good Old Gallery from n/a to 2.1.2. The implications of this vulnerability are serious, as attackers may leverage XSS to execute scripts in the context of the user's browser, potentially leading to data theft or unauthorized actions.
With a CVSS score of 7.1, this vulnerability is deemed high severity. The attack vector is network-based, requiring low complexity and no privileges, but it does necessitate user interaction. This means that an attacker needs the user to click on a malicious link to exploit the vulnerability successfully. The confidentiality, integrity, and availability impacts are all classified as low, but the potential for exploitation remains significant.
Organizations using the affected versions of the Good Old Gallery plugin should prioritize remediation. The status of this vulnerability is currently deferred, but given its high-severity rating, it is critical that organizations take steps to protect their systems. Urgency for defenders is high, and immediate patching is recommended.
Currently, there are no known exploits or public proof of concept (PoC) code associated with this vulnerability, which may provide a temporary window for organizations to address the risk before it is actively exploited. However, vigilance is essential, as attackers often seek to exploit unpatched vulnerabilities.
Vulnerability Details
The official description of CVE-2025-23959 highlights the vulnerability's nature as an improper neutralization of input during web page generation ('Cross-site Scripting') in the Linus Lundahl Good Old Gallery plugin. This issue affects Good Old Gallery versions n/a through 2.1.2.
The vulnerability is classified under CWE-79, which signifies the improper handling of input in a way that allows for XSS attacks. The CVSS score of 7.1 indicates a high severity level, with the following vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L.
The last modified date for this vulnerability is noted as April 23, 2026, with the original publication date being January 22, 2025. Organizations should be aware of the potential impacts and consider the urgency of patching as high.
Technical Analysis
The root cause of CVE-2025-23959 stems from improper input validation within the Good Old Gallery plugin, allowing an attacker to inject scripts that are executed by the browser of a user who visits the compromised page. The attack vector for this flaw is network-based, requiring the user to interact by clicking a malicious link or visiting a manipulated page.
The attack complexity is classified as low, meaning that it does not require any specialized knowledge or resources to exploit. Additionally, attackers do not require any privileges to perform the attack, further increasing the ease of exploitation. User interaction is required, as the victim must click on a link for the attack to be successful.
The impact on confidentiality, integrity, and availability is assessed as low, indicating that while the immediate effects of exploitation may not be catastrophic, the potential for data theft and unauthorized actions could still lead to significant consequences for affected users.
Risk & Impact Analysis
Risk to organizations includes the possibility of an attacker leveraging this vulnerability to execute arbitrary scripts in the context of a user's session, which may lead to unauthorized access to data or session hijacking. Given that this is a reflected XSS vulnerability, the blast radius could extend to any user that visits the compromised page, thereby affecting a broader user base.
Organizations should assess the urgency of remediation based on the CVSS score of 7.1, indicating a high priority for patching. Given the potential for exploitation, organizations should prioritize patching immediately.
As the vulnerability is currently listed as deferred, organizations should remain vigilant and monitor for any updates regarding its status. The risk of eventual exploitation increases as more time passes without remediation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The Good Old Gallery plugin is affected from n/a through version 2.1.2. Organizations should consider upgrading to the latest version to mitigate this vulnerability.
Mitigation & Remediation
To remediate this vulnerability, organizations should update the Good Old Gallery plugin to the latest version available. If an immediate patch is not available, consider implementing the following workarounds:
1. Implement input validation and sanitization for user inputs to mitigate XSS risks.
2. Restrict user permissions to limit the impact of potential XSS exploits.
For more robust security measures, consider conducting regular penetration testing to identify and remediate vulnerabilities in your web applications.
Detection Guidance
Monitor logs for unusual input patterns or user behavior that may indicate exploitation attempts. Additionally, look for signs of unauthorized script execution in user sessions.
Establish network signatures to detect potentially malicious requests that leverage this vulnerability.
AppSecure Threat Intelligence Insight
CVE-2025-23959 signifies ongoing challenges in application security, particularly in the context of XSS vulnerabilities. Organizations should take this opportunity to revisit their security posture, especially around input validation and user interaction points. Implementing a comprehensive penetration testing methodology can help uncover similar weaknesses across applications.
Security teams are encouraged to stay informed about emerging trends in application vulnerabilities through resources such as the vulnerability management program and ensure they are prepared to respond to potential threats.
The ongoing evolution of threats, including XSS vulnerabilities, highlights the necessity for a proactive security culture within organizations, ensuring that teams are equipped to mitigate risks effectively.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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