CVE-2025-43818Network attack vector

Stored script execution via unescaped calendar name

Published Sep 29, 2025 · Updated Sep 30, 2025

Stored XSS in Liferay Portal and DXP Calendar widgets allows remote authenticated users to inject script through a crafted calendar name. CalendarUtil.toCalendarJSONObject places the stored name in its JSON output without HTML escaping, causing the widget to render attacker-controlled markup. Calendar-edit permission is required to store the payload, and another user must view the affected widget for script to execute in that viewer's browser.

CVSS severity4.8
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Liferay Portal and DXP Calendar widgets allows remote authenticated users to inject script through a crafted calendar name. CalendarUtil.toCalendarJSONObject places the stored name in its JSON output without HTML escaping, causing the widget to render attacker-controlled markup. Calendar-edit permission is required to store the payload, and another user must view the affected widget for script to execute in that viewer's browser.

The record

CVE
CVE-2025-43818
Published
Sep 29, 2025
Updated
Sep 30, 2025
Vendor
Liferay
Product
Liferay Portal
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.4.3.35 <=7.4.3.110

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Liferay · Liferay Portalversion=7.4.3.35 <=7.4.3.110
Liferay · Liferay DXPversion=2023.Q3.1 <=2023.Q3.6; version=2023.Q4.0 <=2023.Q4.4; version=7.3.10-u25 <=7.3.10-u36; version=7.4.13-u35 <=7.4.13-u92

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.8Liferay Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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