---
id: "CVE-2026-128893"
page: "https://infrastack.ai/live/CVE-2026-128893"
kind: "vulnerability"
aliases: ["CVE-2026-128893"]
title: "Wise Chat WordPress plugin: reflected XSS through 3.4.5"
severity: "high"
cvss: 7.1
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "wise-chat", "fixed": ["3.4.6"], "affected": "<= 3.4.5", "ecosystem": "wordpress"}]
ecosystems: []
tags: ["package", "reflected-xss", "wise-chat", "wordpress", "wordpress-plugin", "xss"]
not_affected_if: ["plugin-not-installed", "updated-to-3.4.6"]
published_at: "2026-11-15T15:16:47+00:00"
first_seen_at: "2026-11-15T15:36:07+00:00"
updated_at: "2026-11-15T15:38:20+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-128893", "first_seen_at": "2026-11-15T15:36:07+00:00"}, {"source": "analyst", "url": "https://wpsec.com/vuln/WPSEC-2026-3134/", "first_seen_at": "2026-11-15T15:38:20+00:00", "cites": ["https://wpsec.com/vuln/WPSEC-2026-3134/", "https://wordpress.org/plugins/wise-chat/"]}]
exploit_sources: []
---

# Wise Chat WordPress plugin: reflected XSS through 3.4.5

Link for people: https://infrastack.ai/live/CVE-2026-128893 (this .md is for agents)

Wise Chat's wise_chat_prepare_image_endpoint action echoes the 'data' parameter back as text/html after checking only a data:image/gif;base64 prefix. It has no nonce check. An unauthenticated attacker can run script in a chat user's browser by getting them to follow a crafted link or visit a malicious page.

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

## Affected

- wordpress:wise-chat affected <= 3.4.5 fixed 3.4.6

## How to check

In WordPress admin > Plugins, check the Wise Chat version; 3.4.5 or lower is affected. Or read the Version header in wp-content/plugins/wise-chat/wise-chat.php. Also check whether the wise_chat_prepare_image_endpoint AJAX action is reachable on the site.

## Fix

Update Wise Chat to 3.4.6 or later (released 2026-11-13 per WPSec).

## Timeline

- 2026-11-15T15:36:07+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-128893
- 2026-11-15T15:38:20+00:00 analyst https://wpsec.com/vuln/WPSEC-2026-3134/ — NVD page returned empty; WordPress.org page gave no changelog text. Facts from WPSec (third party), not vendor, so nothing marked verified. Fix 3.4.6 per WPSec; confirm in the plugin changelog.

## Documents

- [advisory] WPSEC-2026-3134 Wise Chat <= 3.4.5 Reflected XSS https://wpsec.com/vuln/WPSEC-2026-3134/
- [mentions] Wise Chat - WordPress.org plugin page https://wordpress.org/plugins/wise-chat/

## From the sources

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Marcin Wise Chat wise-chat allows Reflected XSS.This issue affects Wise Chat: from n/a through 3.4.5.

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