Plateforme
java
Composant
pybbs
Corrigé dans
6.0.1
CVE-2026-4495 describes a cross-site scripting (XSS) vulnerability discovered in atjiu pybbs version 6.0.0. This flaw resides within the create function of the CommentApiController.java file, allowing attackers to inject malicious scripts. The vulnerability is exploitable remotely and a public proof-of-concept is available, increasing the risk of exploitation. A fix is pending.
Successful exploitation of CVE-2026-4495 allows an attacker to inject arbitrary JavaScript code into the application. This can lead to various malicious actions, including stealing user cookies, redirecting users to phishing sites, or defacing the website. The impact is amplified by the remote accessibility of the vulnerability and the availability of a public exploit, making it easier for attackers to leverage. Given the nature of XSS, attackers could potentially gain access to sensitive user data or compromise the entire application if proper security measures are not in place.
A public proof-of-concept exploit for CVE-2026-4495 is already available, indicating a high likelihood of exploitation. The vulnerability was publicly disclosed on 2026-03-20. The CVSS score of 3.5 (LOW) reflects the relatively limited impact and ease of exploitation. It is advisable to prioritize mitigation efforts due to the public availability of the exploit.
Organizations using atjiu pybbs version 6.0.0 are at immediate risk. Shared hosting environments where multiple applications share the same server are particularly vulnerable, as a successful attack on one application could potentially compromise others. Users who rely on atjiu pybbs for handling user-generated content are also at increased risk.
• java / server:
find /path/to/pybbs/src/main/java/co/yiiu/pybbs/controller/api -name "CommentApiController.java" -print0 | xargs -0 grep -i "create function"• generic web: • Monitor application logs for unusual JavaScript execution patterns or attempts to inject script tags. • Use a web vulnerability scanner to identify XSS vulnerabilities in the application. • Implement Content Security Policy (CSP) to restrict the sources from which scripts can be executed.
disclosure
Statut de l'Exploit
EPSS
0.03% (percentile 8%)
CISA SSVC
Vecteur CVSS
Currently, there is no official patch available for CVE-2026-4495. As a temporary workaround, implement strict input validation and output encoding on all user-supplied data within the CommentApiController.java file. Consider using a Web Application Firewall (WAF) with XSS protection rules to filter out malicious requests. Regularly scan the application for XSS vulnerabilities using automated tools. Monitor application logs for suspicious activity, such as unusual JavaScript execution patterns.
Mettre à jour pybbs à une version ultérieure à la 6.0.0 qui corrige la vulnérabilité de Cross-Site Scripting (XSS). Consulter le site web du fournisseur pour obtenir la dernière version et les instructions de mise à jour.
Analyses de vulnérabilités et alertes critiques directement dans votre boîte mail.
CVE-2026-4495 is a cross-site scripting (XSS) vulnerability in atjiu pybbs version 6.0.0, allowing attackers to inject malicious scripts via the create function in CommentApiController.java.
If you are using atjiu pybbs version 6.0.0, you are potentially affected by this vulnerability. Upgrade to a patched version as soon as it becomes available.
Currently, no official patch is available. Implement input validation, output encoding, and consider a WAF as temporary mitigations.
A public proof-of-concept exploit exists, suggesting a high likelihood of active exploitation.
Refer to the atjiu pybbs project's official website or GitHub repository for updates and advisories regarding CVE-2026-4495.
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