{"id":44776,"date":"2025-05-27T01:50:16","date_gmt":"2025-05-27T01:50:16","guid":{"rendered":""},"modified":"2025-06-02T11:23:39","modified_gmt":"2025-06-02T17:23:39","slug":"cve-2025-47581-high-risk-deserialization-vulnerability-in-elbisnero-wordpress-events-calendar-registration-tickets-plugin","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-47581-high-risk-deserialization-vulnerability-in-elbisnero-wordpress-events-calendar-registration-tickets-plugin\/","title":{"rendered":"<strong>CVE-2025-47581: High-Risk Deserialization Vulnerability in Elbisnero WordPress Events Calendar Registration &#038; Tickets Plugin<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>CVE-2025-47581 is a severe vulnerability that affects the Elbisnero WordPress Events Calendar Registration &#038; Tickets plugin. The vulnerability lies in its deserialization of untrusted data, which allows for object injection. This creates a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-52880-critical-vulnerability-in-insyde-insydeh2o-kernels-potentially-leading-to-system-compromise\/\"  data-wpil-monitor-id=\"51454\">potential for cybercriminals to compromise systems<\/a> or leak data, posing a significant threat to websites using this plugin.<br \/>\nThe security flaw is of great concern due to the popularity of <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-24189-memory-corruption-vulnerability-due-to-maliciously-crafted-web-content-in-various-operating-systems\/\"  data-wpil-monitor-id=\"51751\">WordPress<\/a> and its wide use in creating websites for various purposes, ranging from personal blogs to professional business websites. It is particularly <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-42871-critical-memory-handling-vulnerability-enabling-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"51824\">critical for websites that handle<\/a> sensitive data, where a successful exploit may lead to severe consequences.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-47581<br \/>\nSeverity: Critical (9.8 CVSS score)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31049-untrusted-data-deserialization-vulnerability-in-themeton-dash-exposes-systems-to-object-injection\/\"  data-wpil-monitor-id=\"53826\">System Compromise and Data<\/a> Leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3034689277\" 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>Elbisnero <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6366-critical-privilege-escalation-vulnerability-in-event-list-wordpress-plugin\/\"  data-wpil-monitor-id=\"88966\">WordPress Events<\/a> Calendar Registration &#038; Tickets | up to 2.6.0<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-42828-root-privilege-escalation-vulnerability-in-macos-ventura-13-5\/\"  data-wpil-monitor-id=\"51683\">vulnerability is rooted<\/a> in the plugin&#8217;s deserialization of untrusted data. Deserialization is the process of converting a stream of bytes back into a copy of the original object. However, if an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3090-unauthenticated-remote-attack-leading-to-potential-data-leakage-and-system-compromise\/\"  data-wpil-monitor-id=\"88967\">attacker can manipulate the serialized data<\/a> (the byte stream), they can control the structure of the deserialized object. This control may allow them to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47916-critical-remote-code-execution-vulnerability-in-invision-community-5-0-0\/\"  data-wpil-monitor-id=\"50409\">execute arbitrary code<\/a>, alter data, or perform other malicious activities.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-1148876023\" 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>The following pseudocode demonstrates a conceptual example of how an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5353-local-authenticated-attacker-exploit-in-ivanti-workspace-control\/\"  data-wpil-monitor-id=\"88968\">attacker might exploit<\/a> this vulnerability:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/wp-content\/plugins\/elbisnero-events-calendar\/endpoint HTTP\/1.1\nHost: vulnerable-website.com\nContent-Type: application\/php-serialized-object\nO:8:&quot;Attacker&quot;:2:{s:4:&quot;code&quot;;s:39:&quot;system(&#039;rm -rf \/&#039;); \/\/ Arbitrary code execution&quot;;s:5:&quot;value&quot;;s:5:&quot;dummy&quot;;}<\/code><\/pre>\n<p>In this example, the attacker sends a serialized <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3623-php-object-injection-vulnerability-in-uncanny-automator-wordpress-plugin\/\"  data-wpil-monitor-id=\"50369\">PHP object<\/a> that, when deserialized by the vulnerable plugin, executes the system command &#8216;rm -rf \/&#8217; leading to destructive consequences.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>Users are strongly advised to apply the vendor patch as soon as it&#8217;s available. Until then, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation method, ensuring that serialized objects are not accepted from untrusted sources. Regularly <a href=\"https:\/\/www.ameeba.com\/blog\/unpacking-politico-s-weekly-cybersecurity-update-a-deep-dive-into-the-latest-threat-landscape\/\"  data-wpil-monitor-id=\"50529\">updating your software and employing good cybersecurity<\/a> practices can also significantly reduce the risk.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview CVE-2025-47581 is a severe vulnerability that affects the Elbisnero WordPress Events Calendar Registration &#038; Tickets plugin. The vulnerability lies in its deserialization of untrusted data, which allows for object injection. This creates a potential for cybercriminals to compromise systems or leak data, posing a significant threat to websites using this plugin. The security flaw [&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":[80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-44776","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-rce"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/44776","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=44776"}],"version-history":[{"count":9,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/44776\/revisions"}],"predecessor-version":[{"id":81788,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/44776\/revisions\/81788"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=44776"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=44776"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=44776"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=44776"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=44776"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=44776"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=44776"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=44776"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=44776"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}