CVE-2021-29044Network attack vector

Stored XSS via unneutralized membership comments

Published May 17, 2021 · Updated Jul 9, 2026

Stored XSS in Liferay Portal 7.0.0 through 7.3.5 allows remote attackers to inject script through membership request comments. The Site module stores the comments parameter and renders its unneutralized script or HTML on membership request administration pages; the same flaw affects the specified Liferay DXP fix-pack ranges. Execution requires an administrator to review the stored request, after which the payload runs within the portal origin in that administrator's browser.

CVSS severity6.1
Medium
EPSS probability0.75%
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 7.0.0 through 7.3.5 allows remote attackers to inject script through membership request comments. The Site module stores the comments parameter and renders its unneutralized script or HTML on membership request administration pages; the same flaw affects the specified Liferay DXP fix-pack ranges. Execution requires an administrator to review the stored request, after which the payload runs within the portal origin in that administrator's browser.

The record

CVE
CVE-2021-29044
Published
May 17, 2021
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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