CVE-2025-26791 is a medium-severity vulnerability affecting cure53's DOMPurify library, specifically versions prior to 3.2.4. The vulnerability arises from an incorrect template literal regular expression, which can lead to mutation cross-site scripting (mXSS). This issue poses a significant risk due to the potential for unauthorized script execution in the context of the user’s browser.
With a CVSS score of 4.5, this vulnerability is classified as medium severity. Although it is not actively exploited, the implications of mXSS can be severe, allowing attackers to manipulate web applications. Organizations utilizing DOMPurify should address this vulnerability promptly to prevent exploitation.
Risk to organizations includes potential data breaches, loss of user trust, and compliance issues. Therefore, organizations should prioritize patching immediately. The affected versions are all prior to the release of version 3.2.4, which includes the necessary fix for this vulnerability.
It is essential for security teams to stay informed about vulnerabilities in the libraries and frameworks they use. Regular updates and patches are crucial to maintaining a secure environment.
Vulnerability Details
This vulnerability allows for mutation cross-site scripting (mXSS) due to an incorrect template literal regular expression in DOMPurify versions prior to 3.2.4. The vulnerability has a CVSS score of 4.5, indicating medium severity. The affected product is DOMPurify, maintained by cure53.
The vulnerability was published on February 14, 2025, and is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')).
Technical Analysis
The root cause of this vulnerability is the incorrect implementation of a regular expression within the DOMPurify library, leading to potential mXSS attacks. The attack vector is local, which means that an attacker must have access to the environment where the application is running. The attack complexity is high, and no privileges are required for exploitation, nor is user interaction necessary.
The impacts on confidentiality and integrity are both considered low, while there is no impact on availability. These factors contribute to the overall risk profile of the vulnerability.
Risk & Impact Analysis
The deployment risk involves the possibility of an attacker exploiting the mXSS vulnerability in vulnerable versions of DOMPurify. Given its medium severity, organizations should address this issue within their priority patch cycle. The potential blast radius could include any application utilizing an affected version of DOMPurify, making it critical for developers and security teams to assess their use of this library.
Urgency for remediation is underscored by the potential for unauthorized script execution, which can lead to data theft or manipulation. Organizations should schedule remediation efforts to ensure that all instances of the library are updated to version 3.2.4 or later.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of DOMPurify prior to 3.2.4 are affected by this vulnerability. Organizations should ensure that they are using an updated version to mitigate the risk of mXSS.
Mitigation & Remediation
To remediate this vulnerability, organizations should upgrade to DOMPurify version 3.2.4 or later. If a patch is unavailable, organizations should consider implementing configuration hardening strategies and monitoring for any unusual behavior associated with the library's usage.
For more comprehensive security measures, organizations may also engage in penetration testing to identify any other vulnerabilities that may exist.
Detection Guidance
Organizations should monitor logs for any indicators of compromise related to DOMPurify usage. Behavioral anomalies or unexpected script executions can signal potential exploitation. Keeping an eye on network signatures that deviate from the norm can also help detect malicious activities.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability highlights the importance of maintaining up-to-date libraries and frameworks. The pattern of vulnerabilities stemming from improper input validation continues to present challenges for development teams.
Security teams should take this opportunity to revisit their vulnerability management program to ensure robust processes for identifying and remediating vulnerabilities proactively.
Additionally, the ongoing trend of mXSS vulnerabilities serves as a reminder for developers to prioritize secure coding practices. Engaging in regular penetration testing can also help in identifying such weaknesses before they are exploited.
In conclusion, organizations must remain vigilant and responsive to vulnerabilities like CVE-2025-26791 to safeguard their applications and data.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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