---
id: CVE-2026-34598
title: YesWiki is a wiki system written in PHP
summary: >-
  YesWiki is a wiki system written in PHP. Prior to version 4.6.0, a stored and
  blind XSS vulnerability exists in the form title field. A malicious attacker
  can inject JavaScript without any authentication via a form title that is
  saved in…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
  - CWE-87
vendor: yeswiki
product: yeswiki
affected:
  - yeswiki < 4.6.0
patched:
  - yeswiki 4.6.0
published: '2026-04-02'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T22:10:00.247'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-34598'
references:
  - url: 'https://github.com/YesWiki/yeswiki/releases/tag/v4.6.0'
    label: security-advisories@github.com
  - url: 'https://github.com/YesWiki/yeswiki/security/advisories/GHSA-37fq-47qj-6j5j'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00314
epssPercentile: 0.22185
ingestedAt: '2026-10-06T22:23:15.912Z'
---

## Overview

YesWiki is a wiki system written in PHP. Prior to version 4.6.0, a stored and blind XSS vulnerability exists in the form title field. A malicious attacker can inject JavaScript without any authentication via a form title that is saved in the backend database. When any user visits that injected page, the JavaScript payload gets executed. This issue has been patched in version 4.6.0.

## Affected

- `yeswiki < 4.6.0`

## Remediation

Upgrade past the affected range:

- `yeswiki 4.6.0`