CVE-2026-4895Network attack vector

Contributor-level stored XSS via whole-string source replacement

Published Apr 11, 2026 · Updated Apr 11, 2026

Stored XSS in WPSoul Greenshift 12.8.9 and earlier allows remote authenticated users to execute scripts through crafted image-block markup. The gspb_greenShift_block_script_assets() function applies str_replace() to the full rendered HTML, so attacker-controlled src= text inside an attribute causes the inserted quotation mark to escape that attribute. Contributor-level access and a greenshift-blocks/image block with disablelazy enabled are required; scripts run when visitors open the saved page.

CVSS severity6.4
Medium
EPSS probability0.42%
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 WPSoul Greenshift 12.8.9 and earlier allows remote authenticated users to execute scripts through crafted image-block markup. The gspb_greenShift_block_script_assets() function applies str_replace() to the full rendered HTML, so attacker-controlled src= text inside an attribute causes the inserted quotation mark to escape that attribute. Contributor-level access and a greenshift-blocks/image block with disablelazy enabled are required; scripts run when visitors open the saved page.

The record

CVE
CVE-2026-4895
Published
Apr 11, 2026
Updated
Apr 11, 2026
Vendor
WPSoul
Product
Greenshift
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 11, 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 <=12.8.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WPSoul · Greenshiftversion=0 <=12.8.9

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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

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Your stack

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