CVE-2025-4054Network attack vector

Unauthenticated stored XSS via unsanitized comment highlights

Published May 7, 2025 · Updated Apr 8, 2026

Stored XSS in Relevanssi 4.24.3 and earlier and Premium 2.27.4 and earlier allows remote attackers to run scripts through search highlights. The highlighting path in lib/excerpts-highlights.php passes comment content into generated excerpts without sufficient sanitization or output escaping. Comments must be included in excerpts, and a user must open the affected post through search results, allowing the stored script to run in that user's browser.

CVSS severity6.1
Medium
EPSS probability0.39%
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 Relevanssi 4.24.3 and earlier and Premium 2.27.4 and earlier allows remote attackers to run scripts through search highlights. The highlighting path in lib/excerpts-highlights.php passes comment content into generated excerpts without sufficient sanitization or output escaping. Comments must be included in excerpts, and a user must open the affected post through search results, allowing the stored script to run in that user's browser.

The record

CVE
CVE-2025-4054
Published
May 7, 2025
Updated
Apr 8, 2026
Vendor
eurodata comesio solutions GmbH
Product
Relevanssi
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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?

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

  1. Affected versionversion=0 <=4.24.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

eurodata comesio solutions GmbH · Relevanssiversion=0 <=4.24.3
eurodata comesio solutions GmbH · Relevanssi Premiumversion=0 <=2.27.4

Published CVSS scores

6.1WordfenceCVSS: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')
T1189Drive-by Compromise

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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