---
id: "CVE-2026-97328"
kind: "vulnerability"
aliases: ["CVE-2026-97328"]
title: "WebP Express WordPress plugin: unescaped HTML attributes enable stored cross-site scripting"
severity: "high"
cvss: 7.5
epss: 0.00216
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["package", "php", "self-hosted", "wordpress"]
not_affected_if: ["default-config", "plugin-not-installed"]
published_at: "2026-10-22T06:17:15+00:00"
first_seen_at: "2026-10-23T21:57:30+00:00"
updated_at: "2026-10-25T03:15:14+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97328", "first_seen_at": "2026-10-23T21:57:30+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-97328", "first_seen_at": "2026-10-24T07:15:51+00:00"}]
---

# WebP Express WordPress plugin: unescaped HTML attributes enable stored cross-site scripting

The WebP Express WordPress plugin before 0.25.16 does not escape values its bundled HTML parser writes into element attributes when a non-default image delivery mode is enabled. An unauthenticated attacker can submit content that is stored and runs as cross-site scripting in the browser of anyone who views an affected page, including administrators.

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

## How to check

- Check the installed plugin version in the WordPress admin Plugins screen or with `wp plugin get webp-express --field=version`
- Check whether a non-default image delivery mode is enabled in the WebP Express settings (unknown which mode the sources name)

## Fix

- Update WebP Express to `0.25.16` or later
- If an update is not possible, disable the plugin until it is updated

## Timeline

- 2026-10-23T21:57:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-97328
- 2026-10-24T07:15:51+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-97328

## From the sources

The WebP Express WordPress plugin before 0.25.16 does not escape values that its bundled HTML parser re-emits into element attributes when a non-default image delivery mode is enabled, allowing unauthenticated users to submit content that is stored and later executed as Cross-Site Scripting in the browser of any user viewing an affected page, including administrators.

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