---
id: "CVE-2026-120428"
kind: "vulnerability"
aliases: ["CVE-2026-120428"]
title: "PandaWiki: stored XSS lets attackers steal admin session tokens"
severity: "medium"
cvss: 6.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["nginx", "package", "pandawiki", "self-hosted"]
not_affected_if: ["version-outside-range"]
published_at: "2026-11-02T15:17:24+00:00"
first_seen_at: "2026-11-02T15:24:01+00:00"
updated_at: "2026-11-02T15:26:21+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-120428", "first_seen_at": "2026-11-02T15:24:01+00:00"}]
---

# PandaWiki: stored XSS lets attackers steal admin session tokens

PandaWiki 3.65.0 through 3.87.5 accepts unauthenticated uploads of HTML files disguised with image extensions. When an administrator opens a crafted link to the uploaded file, the browser renders it inline and the attacker can read the panda_wiki_token JWT to take over the session.

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

## How to check

- Check the installed PandaWiki version against the affected range 3.65.0 through 3.87.5
- Look for uploaded files with image extensions whose content is HTML under the static-file storage path

## Fix

- Move to a PandaWiki release newer than `3.87.5`; the exact fixed version is unknown from the sources

## Timeline

- 2026-11-02T15:24:01+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-120428

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/pandawiki-3.65.0-through-3.87.5-stored-xss-via-static-file-pdf-query-string-bypass

## From the sources

PandaWiki 3.65.0 through 3.87.5 contains a stored cross-site scripting vulnerability that allows unauthenticated attackers to upload HTML files with image extensions via /share/v1/common/file/upload. Attackers can lure administrators to /static-file/<key>?a=.pdf, bypassing the nginx attachment header to serve HTML inline and steal the panda_wiki_token JWT for session takeover.

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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_