{"id":38199,"date":"2025-05-14T19:51:53","date_gmt":"2025-05-14T19:51:53","guid":{"rendered":""},"modified":"2025-08-30T04:38:59","modified_gmt":"2025-08-30T10:38:59","slug":"cve-2025-26844-critical-cookie-handling-vulnerability-in-znuny","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-26844-critical-cookie-handling-vulnerability-in-znuny\/","title":{"rendered":"CVE-2025-26844: Critical Cookie Handling Vulnerability in Znuny<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The Common Vulnerabilities and Exposures (CVE) system recently added a new entry, CVE-2025-26844, a critical vulnerability discovered in Znuny up to version 7.1.3. This issue is related to the improper handling of cookies, specifically, the application sets a cookie without the crucial HttpOnly flag. Given the severity of the vulnerability<\/a>, which has been assigned a CVSS score of 9.8, it is imperative for all organizations using affected versions of Znuny to understand and mitigate the risks involved. This vulnerability could potentially lead to system<\/a> compromise or data leakage if exploited by malicious actors.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-26844
\nSeverity: Critical (9.8 CVSS)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: Potential system<\/a> compromise or data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Znuny | Up to 7.1.3<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability arises from the failure of Znuny<\/a> to set the HttpOnly flag for a cookie. This flag restricts access to the cookie from client-side scripts, thus preventing cross-site scripting<\/a> (XSS) attacks. When the HttpOnly flag is not set, an attacker can potentially use client-side script to read the cookie’s data<\/a>, which could contain sensitive information. This opens the door<\/a> for various attacks, including session hijacking and identity theft.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

An attacker might execute a script like the following to exploit this vulnerability<\/a>:<\/p>\n

<script>\ndocument.write('');\n<\/script><\/code><\/pre>\n
In this conceptual example, the attacker’s script sends the user’s cookies<\/a> to the attacker’s server. This is possible because the HttpOnly flag is not set, allowing the document.cookie JavaScript property to access the cookie’s data<\/a>.
\nPlease note that this is a conceptual example and is intended to illustrate how the vulnerability<\/a> could be exploited. Actual attacks may be more complex and varied in nature.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
To mitigate this vulnerability, users are advised to apply the vendor patch as soon as possible. Until the patch can be applied, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. These systems can be configured to detect and block attempts to exploit this vulnerability<\/a>. Furthermore, ensure to follow the principle of least privilege, and monitor your systems for any unusual activity.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The Common Vulnerabilities and Exposures (CVE) system recently added a new entry, CVE-2025-26844, a critical vulnerability discovered in Znuny up to version 7.1.3. This issue is related to the improper handling of cookies, specifically, the application sets a cookie without the crucial HttpOnly flag. Given the severity of the vulnerability, which has been assigned […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[81],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-38199","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-xss"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t