Relevanssi <= 4.28.3 - Unauthenticated Stored Cross-Site Scripting via Comment Content

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-97641
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-02 08:17:05 UTC
Updated2026-10-02 13:18:55 UTC
DescriptionThe Relevanssi – A Better Search plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content in all versions up to, and including, 4.28.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is only exploitable when the administrator has configured a non-empty value for the "Allowable tags in excerpts" setting, such as the default example value of &lt;p&gt;&lt;a&gt;&lt;strong&gt;, as the prefix-matching regex must have an allowable tag whose name is a prefix of the injected tag name.

Risk And Classification

Primary CVSS: v3.1 7.2 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS: 0.002410000 probability, percentile 0.138290000 (date 2026-10-02)

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED7.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Comesio Relevanssi A Better Search affected 4.28.3 semver Not specified

References

ReferenceSourceLinkTags
github.com/msaari/relevanssi/commit/3dddec3416fbda298e18649127f31557398d... [email protected] github.com
plugins.trac.wordpress.org/browser/relevanssi/tags/4.28.3/lib/indexing.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/relevanssi/tags/4.28.3/lib/admin-ajax.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/relevanssi/tags/4.28.3/lib/excerpts-highlights.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/relevanssi/tags/4.28.3/lib/excerpts-highlights.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/relevanssi/tags/4.28.3/lib/excerpts-highlights.php [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/47751ff1-2f22-4335-8e75-7ff1b... [email protected] www.wordfence.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Yuto Hyakumoto (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-09-24T18:08:11.000ZVendor Notified
CNA2026-10-01T19:22:45.000ZDisclosed

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