CVE-2026-15425Network attack vector

Stored XSS via unescaped decoded post slug

Published Jul 25, 2026 · Updated Jul 25, 2026

Stored XSS in Yoast SEO 28.0 and earlier allows remote authenticated users to execute scripts through a crafted post slug. The bulk editor's Page URL/Slug column decodes the permalink with rawurldecode() and inserts the resulting slug into anchor text without HTML escaping. Author-level access and pretty permalinks are required; viewing the affected bulk-editor listing executes the stored script in that viewer's browser.

CVSS severity6.4
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Yoast SEO 28.0 and earlier allows remote authenticated users to execute scripts through a crafted post slug. The bulk editor's Page URL/Slug column decodes the permalink with rawurldecode() and inserts the resulting slug into anchor text without HTML escaping. Author-level access and pretty permalinks are required; viewing the affected bulk-editor listing executes the stored script in that viewer's browser.

The record

CVE
CVE-2026-15425
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
Yoast
Product
Yoast SEO
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <=28.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Yoast · Yoast SEOversion=0 <=28.0

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo