CVE-2025-25300 is a low-severity vulnerability affecting smartbanner.js, a customizable smart app banner for iOS and Android. This vulnerability allows the exposure of `window.opener` when users click on the smartbanner `View` link, particularly when navigating to third-party pages. Attackers may leverage this exposure for redirection or injection attacks on the original page that uses smartbanner. As of version 1.14.1, the library automatically populates `rel="noopener"` to links, significantly mitigating this risk. Organizations should prioritize upgrading to this version for improved security.
The vulnerability's CVSS score is 1.3, classifying it as low severity. The low score indicates that while the vulnerability exists, the impact on confidentiality is none, and the integrity impact is low. The risk to organizations includes potential exposure to third-party manipulation. Therefore, organizations are advised to address this vulnerability in their patch cycle. The recommended upgrade is essential for those who leverage smartbanner.js in their applications.
For organizations unable to upgrade immediately, some workarounds can be implemented. It is advisable to ensure that the `View` link directs users only to the App Store or Google Play Store, where security measures are enforced by the respective app stores. If the `View` link must go to a third-party page, limiting the use of smartbanner.js to iOS can decrease the scope of the vulnerability, as Safari 12.1 enforces `rel="noopener"` on all `target="_blank"` links.
In summary, while CVE-2025-25300 is classified as a low-severity vulnerability, its existence poses a potential risk to organizations that utilize the affected versions of smartbanner.js. Organizations should prioritize patching immediately to reduce their exposure to exploitation.
Vulnerability Details
The official description of CVE-2025-25300 states that clicking the smartbanner `View` link and navigating to a third-party page leaves `window.opener` exposed. This vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation) and CWE-601 (URL Redirection to Untrusted Site). As previously mentioned, the vulnerability is present in versions of smartbanner.js prior to 1.14.1.
The CVSS score for this vulnerability is 1.3, indicating a low severity level. The attack vector is classified as NETWORK, with low attack complexity and no privileges required to exploit the vulnerability. User interaction is passive, meaning that an attacker does not need to actively engage a user to exploit this vulnerability.
The vulnerability was published on February 18, 2025, and has been marked as deferred in status. The relevant weaknesses associated with this vulnerability include CWE-79 and CWE-601.
Technical Analysis
The root cause of CVE-2025-25300 lies in the handling of links within smartbanner.js. By failing to implement `rel="noopener"` in links, the library inadvertently exposes `window.opener`, which can be misused by malicious actors to manipulate the original page. This exposure can lead to various attacks, including redirection to phishing sites or injection of malicious scripts on the original page.
The primary attack vector is through user interaction with the smartbanner `View` link. The attack complexity is low, as it requires no special conditions to exploit. Attackers can initiate this by simply providing a malicious link that users may click while navigating through the smartbanner.
No privileges are required to exploit this vulnerability, and user interaction is passive, further enhancing the ease of exploitation. The confidentiality impact is none, while the integrity impact is low, indicating that while sensitive information may not be compromised, the integrity of the original page can be affected by third-party manipulation.
Risk & Impact Analysis
Risk to organizations includes exposure to malicious redirection or injection attacks due to the improper handling of links in smartbanner.js. The potential blast radius could affect any organization using the vulnerable versions, especially those that rely on third-party links in their applications.
Given the CVSS score of 1.3, the urgency assessment for organizations should be moderate. While the severity is low, the nature of potential attacks warrants attention and should be addressed in the next patch cycle.
Organizations should also consider the EPSS score of 0.00125, indicating a low likelihood of exploitation, but should not ignore the implications of the vulnerability. The combination of the CVSS score and the potential for impact suggests that while immediate action may not be required, planning for remediation is essential.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of smartbanner.js are all versions prior to 1.14.1. Organizations should verify their deployment and ensure they are running the latest version to safeguard against this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching immediately by upgrading to version 1.14.1 of smartbanner.js, which includes the fix for this vulnerability. If immediate upgrading is not feasible, implementing workarounds is recommended.
Ensure that the `View` link is only directing users to the App Store or Google Play Store. If third-party URLs are necessary, limit the use of smartbanner.js to iOS devices, as Safari enforces `rel="noopener"` on `target="_blank"` links since version 12.1.
For further guidance, organizations may consider utilizing penetration testing services to assess their security posture and identify any additional vulnerabilities.
Detection Guidance
Organizations should monitor their logs for any unusual activity related to smartbanner.js links. Behavioral anomalies, such as unexpected redirections or modifications in the original page content, should be flagged. Additionally, network signatures that indicate the use of compromised links should be investigated.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-25300 highlights the importance of secure coding practices in web development. This vulnerability represents a pattern of oversight where user interactions with web components can expose sensitive functionalities. Security teams must ensure that libraries and frameworks used in their applications are regularly updated and scrutinized for vulnerabilities.
Organizations should consider implementing a robust vulnerability management program to facilitate ongoing assessments and ensure that similar vulnerabilities are identified and remediated proactively.
For security teams, understanding the implications of CVE-2025-25300 reinforces the need for continuous education on application security best practices. The lessons learned from this vulnerability can guide future development strategies and promote a security-first mindset among developers.
Finally, organizations should remain vigilant and consider engaging in penetration testing methodology to continuously refine their security posture and ensure that they are not exposed to similar vulnerabilities in the future.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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