mod_security and WordPress

I just upgraded this blog to the latest version of WordPress, and I noticed that I wasn’t able to post. Got 403 Forbidden error message.

Checking mod_security’s log file, I saw these messages:

POST /wp-admin/post.php HTTP/1.1
mod_security-message: Access denied with code 403. Invalid cookie format: Cookie value is missing #1
mod_security-action: 403

After googling around, turned out it’s because of a setting in a mod_security.
Basically, you’ll need to replace SecFilterCheckCookieFormat to SecFilterNormalizeCookies in your mod_security config.

After doing this and restarting Apache, I can post again to WordPress.

Hope this helps somebody else with similar problem.

41 thoughts on “mod_security and WordPress

  1. Thanks, I’ve a few ideas to make this blog more useful, and this is the first step. Hopefully I’ll be able to implement the changes faster.

  2. That’s good news that you eventually got it sorted. I’m sure someone else will come across the same problem, this should help them a lot.

  3. I had similar issues when I upgraded, but I think I’ve got them all sorted out now. First time I’ve had issues with an upgrade. Thanks for the help

  4. I ran into this exact same problem and was searching high and low. I thought I was going to have to go back to my previous version. Anyhow – your solution saved me a lot of hassle – thanks!

  5. There’s a very amusing thread about this over at’s flames forum – best quote “But it is kind of flattering for them to think that the demoscene coders now have found a way to pack 1 whole tv series episode into a ~30KB file 🙂 “.

  6. Hi. I am using Plesk and I cannot find any place to edit the .htaccesss and make these changes. Can you please give me further instruction?
    I am having this same problem but cannot correct it.
    Thanks for your help in advance!

  7. I’ve had the same problem with y WordPress. Thanks to you, now I’m able to post again 🙂

  8. Thanks for this. I also had issues, was very frustrating but then I found your post and it solved it.

    Many thanks.

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