Simon Willison’s Weblog

11th January 2007 - Link Blog

The Adobe PDF XSS Vulnerability. If you host a PDF file anywhere on your site, you’re vulnerable to an XSS attack due to a bug in Acrobat Reader versions below 8. The fix is to serve PDFs as application/octet-stream to avoid them being displayed inline.

Posted 11th January 2007 at 4:23 pm

Recent articles

Mr. Chatterbox is a (weak) Victorian-era ethically trained model you can run on your own computer - 30th March 2026
Vibe coding SwiftUI apps is a lot of fun - 27th March 2026
Experimenting with Starlette 1.0 with Claude skills - 22nd March 2026

This is a link post by Simon Willison, posted on 11th January 2007.

adobe 29 pdf 39 security 587 vulnerability 5 xss 60

Monthly briefing

Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments.

Pay me to send you less!

Sponsor & subscribe