CVE-2026-56006Public exploitNetwork attack vector

Reflected XSS via unsanitized upgrade return URL

Published Jun 25, 2026 · Updated Jun 25, 2026

Reflected XSS in H5P WordPress Plugin 1.17.6 and earlier allows remote attackers to execute scripts through a crafted return URL. The library upgrade success message concatenates the unsanitized return parameter into an anchor href, allowing a script-bearing URL to reach the browser. Exploitation requires a privileged user to follow the crafted link; the script then runs in the WordPress site's origin with that user's session privileges.

CVSS severity7.1
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in H5P WordPress Plugin 1.17.6 and earlier allows remote attackers to execute scripts through a crafted return URL. The library upgrade success message concatenates the unsanitized return parameter into an anchor href, allowing a script-bearing URL to reach the browser. Exploitation requires a privileged user to follow the crafted link; the script then runs in the WordPress site's origin with that user's session privileges.

The record

CVE
CVE-2026-56006
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
H5P Group
Product
H5P WordPress Plugin
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=n/a <=1.17.6 changes=[{"at":"1.17.7","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

H5P Group · H5P WordPress Pluginversion=n/a <=1.17.6 changes=[{"at":"1.17.7","status":"unaffected"}]

Published CVSS scores

7.1PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

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 exploitPublished

Weakness, pattern, technique

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

Public exploit references

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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