CVE-2026-5293Network attack vector

Subscriber-level stored XSS via unchecked theme update

Published May 20, 2026 · Updated May 20, 2026

Stored XSS in OLIVESYSTEM Diagnosis Generator 1.4.16 and earlier allows remote authenticated users to inject scripts via the js parameter. The admin_init-hooked themeFunc() accepts theme-update requests without checking capabilities, while save() removes escaping with stripslashes() before JavaScript is written to theme files. Subscriber-level access is sufficient, and the stored script runs when a page containing the diagnosis-form shortcode is viewed.

CVSS severity6.4
Medium
EPSS probability0.31%
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 OLIVESYSTEM Diagnosis Generator 1.4.16 and earlier allows remote authenticated users to inject scripts via the js parameter. The admin_init-hooked themeFunc() accepts theme-update requests without checking capabilities, while save() removes escaping with stripslashes() before JavaScript is written to theme files. Subscriber-level access is sufficient, and the stored script runs when a page containing the diagnosis-form shortcode is viewed.

The record

CVE
CVE-2026-5293
Published
May 20, 2026
Updated
May 20, 2026
Vendor
OLIVESYSTEM
Product
診断ジェネレータ作成プラグイン
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 20, 2026CVE publishedPublication date reported by the CVE source.
  2. May 20, 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 <=1.4.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OLIVESYSTEM · 診断ジェネレータ作成プラグインversion=0 <=1.4.16

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')
T1059.007Command and Scripting Interpreter: JavaScript/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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