---
id: "CVE-2026-116203"
kind: "vulnerability"
aliases: ["CVE-2026-116203"]
title: "YesWiki: unencoded filtertags output lets anonymous users inject stored scripts"
severity: "medium"
cvss: 6.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["package", "php", "self-hosted", "yeswiki"]
not_affected_if: ["yeswiki-4.7.0-or-later"]
published_at: "2026-10-25T14:17:01+00:00"
first_seen_at: "2026-10-25T14:41:23+00:00"
updated_at: "2026-10-25T14:42:54+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116203", "first_seen_at": "2026-10-25T14:41:23+00:00"}]
---

# YesWiki: unencoded filtertags output lets anonymous users inject stored scripts

YesWiki before 4.7.0 echoes attacker-controlled token values in its filtertags action without output encoding. An anonymous attacker can store markup that runs JavaScript in the browser of every visitor to the affected page.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed YesWiki version in the wiki's configuration or release files; versions below `4.7.0` are affected
- Look for stored markup containing `<script` or event handlers in pages that use the filtertags action

## Fix

- Upgrade YesWiki to `4.7.0` or later
- Until upgraded, unknown whether a configuration workaround exists

## Timeline

- 2026-10-25T14:41:23+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116203

## From the sources

YesWiki before 4.7.0 contains a stored cross-site scripting vulnerability in the filtertags action, which echoes attacker-controlled token values without output encoding. Anonymous attackers can inject markup via action-attribute parameters that bypasses the allow_raw_html gate, executing JavaScript for every page viewer.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_