---
description: AI Security for Apps now supports an updated set of PII categories.
title: Updated PII detection for AI Security for Apps
image: https://developers.cloudflare.com/changelog/post/2026-09-01-ai-security-for-apps-pii-detection/og.png?v=20b64f939d4a6d9f
---

[Skip to content](#main-content)

[View RSS feeds](https://developers.cloudflare.com/fundamentals/new-features/available-rss-feeds/) [ Subscribe to RSS](https://developers.cloudflare.com/changelog/rss/index.xml)

[Back to all posts](https://developers.cloudflare.com/changelog)

September 1, 2026

## Updated PII detection for AI Security for Apps

[WAF](https://developers.cloudflare.com/waf/)

Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/changelog/post/2026-09-01-ai-security-for-apps-pii-detection/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

AI Security for Apps now supports an updated set of categories for detecting personally identifiable information (PII) in incoming prompts.

The values available in [`cf.llm.prompt.pii_categories`](https://developers.cloudflare.com/ruleset-engine/rules-language/fields/reference/cf.llm.prompt.pii_categories/) have changed. Existing WAF custom rules remain valid, but rules that reference a removed or renamed category will no longer match that category. Review any rules that use this field and update their expressions to use the currently supported values.

For the complete category list and configuration guidance, refer to [PII detection](https://developers.cloudflare.com/waf/detections/ai-security-for-apps/pii-detection/).

```json
{"@context":"https://schema.org","@type":"BlogPosting","@id":"https://developers.cloudflare.com/changelog/post/2026-09-01-ai-security-for-apps-pii-detection/#page","headline":"Updated PII detection for AI Security for Apps","description":"AI Security for Apps now supports an updated set of PII categories.","url":"https://developers.cloudflare.com/changelog/post/2026-09-01-ai-security-for-apps-pii-detection/","inLanguage":"en","image":"https://developers.cloudflare.com/changelog/post/2026-09-01-ai-security-for-apps-pii-detection/og.png?v=20b64f939d4a6d9f","dateModified":"2026-09-01","datePublished":"2026-09-01","publisher":{"@type":"Organization","name":"Cloudflare","description":"One platform for your apps, agents, and workforce. Build, secure, and scale without managing infrastructure","url":"https://www.cloudflare.com/","sameAs":["https://github.com/cloudflare","https://www.linkedin.com/company/cloudflare","https://x.com/cloudflare"],"logo":{"@type":"ImageObject","url":"https://developers.cloudflare.com/logo.svg"},"address":{"@type":"PostalAddress","streetAddress":"101 Townsend St","addressLocality":"San Francisco","addressRegion":"CA","postalCode":"94107","addressCountry":"US"},"contactPoint":[{"@type":"ContactPoint","contactType":"Customer Support","url":"https://support.cloudflare.com/","availableLanguage":["English"]},{"@type":"ContactPoint","contactType":"Sales","url":"https://www.cloudflare.com/contact/","availableLanguage":["English"]}]},"isPartOf":{"@type":"WebSite","@id":"https://developers.cloudflare.com/#website","name":"Cloudflare Docs","url":"https://developers.cloudflare.com/"}}
```