CVE-2025-43817 Overview
CVE-2025-43817 describes multiple reflected cross-site scripting (XSS) vulnerabilities in Liferay Portal and Liferay Digital Experience Platform (DXP). Attackers can inject arbitrary web script or HTML through the redirect parameter of the Announcements and Alerts portlets. The flaw affects Liferay Portal versions 7.4.3.74 through 7.4.3.111 and multiple Liferay DXP release trains. The issue is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation).
Critical Impact
Authenticated remote attackers can trick users into loading crafted URLs that execute arbitrary JavaScript in the victim's browser session, enabling session data theft, credential harvesting, and portal actions on behalf of the victim.
Affected Products
- Liferay Portal 7.4.3.74 through 7.4.3.111
- Liferay DXP 2023.Q4.0 through 2023.Q4.6 and 2023.Q3.1 through 2023.Q3.8
- Liferay DXP 7.4 update 74 through update 92
Discovery Timeline
- 2025-09-29 - CVE-2025-43817 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-43817
Vulnerability Analysis
The vulnerability is a reflected XSS flaw in two Liferay portlets: Announcements and Alerts. Both portlets accept a redirect parameter that is echoed back into rendered HTML without sufficient output encoding. An attacker crafts a URL containing JavaScript payloads in this parameter and lures an authenticated user into clicking it. The Liferay server reflects the malicious value into the response, and the browser executes the script within the victim's session context.
Because the payload executes inside the authenticated Liferay session, an attacker can read the DOM, exfiltrate CSRF tokens, invoke portal APIs as the victim, or pivot to internal administrative actions if the victim holds elevated roles. The scope is limited to the victim's browser context and requires user interaction, which reduces exploitation reliability but not overall impact on confidentiality and integrity of portal data.
Root Cause
The root cause is improper neutralization of user-supplied input in the redirect request parameter before it is written into HTML output. The Announcements and Alerts portlets fail to apply context-appropriate encoding (HTML attribute or JavaScript encoding) on this parameter, allowing script tags and event-handler payloads to survive server-side rendering.
Attack Vector
Exploitation is network-based and requires an authenticated session plus user interaction. The attacker delivers a crafted link (email, chat, forum post, or malicious page) pointing at the vulnerable Liferay portlet with an XSS payload embedded in the redirect query parameter. When the target opens the link while authenticated to Liferay, the reflected payload executes.
No verified proof-of-concept has been published. Refer to the Liferay Security Advisory CVE-2025-43817 for vendor technical details.
Detection Methods for CVE-2025-43817
Indicators of Compromise
- HTTP requests to Liferay Announcements or Alerts endpoints containing redirect= parameter values with <script, javascript:, onerror=, onload=, or URL-encoded equivalents (%3Cscript, %6Aavascript).
- Unexpected outbound requests from user browsers to attacker-controlled domains shortly after visiting Liferay portal URLs.
- Portal audit-log entries showing account actions initiated immediately after a user clicked an externally sourced Liferay link.
Detection Strategies
- Inspect Liferay access logs and reverse-proxy logs for anomalous redirect parameter values on /announcements and /alerts portlet paths.
- Deploy web application firewall (WAF) rules that flag common reflected-XSS token patterns targeting Liferay portlet URLs.
- Correlate email or messaging gateways with URL-rewriting telemetry to identify links pointing at vulnerable Liferay hosts with suspicious query strings.
Monitoring Recommendations
- Enable Content Security Policy (CSP) violation reporting to capture script executions blocked by CSP directives on Liferay hosts.
- Track browser-side execution telemetry from endpoint agents for unexpected script activity originating from Liferay origin URLs.
- Alert on portal administrative actions performed within seconds of an inbound external referrer navigation to redirect-bearing URLs.
How to Mitigate CVE-2025-43817
Immediate Actions Required
- Upgrade Liferay Portal to a fixed release beyond 7.4.3.111 and Liferay DXP to a patched release train per the vendor advisory.
- Apply the Liferay hotfix or service pack addressing CVE-2025-43817 on all affected DXP 2023.Q3, 2023.Q4, and 7.4 update deployments.
- Restrict Announcements and Alerts portlet access to authenticated, trusted user roles until patching completes.
Patch Information
Liferay has published a security advisory for CVE-2025-43817 with remediation guidance. Consult the Liferay Security Advisory CVE-2025-43817 for the exact fixed builds, hotfix identifiers, and upgrade instructions applicable to your deployment channel.
Workarounds
- Deploy a WAF rule to strip or reject redirect parameter values containing HTML/JavaScript metacharacters on Announcements and Alerts URLs.
- Enforce a strict Content Security Policy that disallows inline scripts (script-src 'self') to blunt reflected payload execution.
- Train portal users to avoid clicking Liferay links received from external, unverified sources during the patch window.
# Example WAF rule (ModSecurity) blocking script payloads in redirect parameter
SecRule ARGS:redirect "@rx (?i)(<script|javascript:|onerror=|onload=)" \
"id:1004381,phase:2,deny,status:403,msg:'CVE-2025-43817 Liferay XSS attempt'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
