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Opened 13 years ago

Last modified 5 days ago

#5272 reopened defect (bug)

WordPress allows anonymous user to see slug for private post by guessing post number

Reported by: tzafrir Owned by: SergeyBiryukov
Milestone: 5.7 Priority: normal
Severity: normal Version: 2.3.1
Component: Security Keywords: has-patch has-unit-tests
Focuses: Cc:


I have pretty permalinks enabled, and I set a post as private.

Entering http://blog.url/?p=(postid) will redirect the user, any user, to http://blog.url/perma/link/, and only then give him a 404 error.

Depending on permalink structure, this shows the private post's title to anyone who figures out its post number.

Attachments (1)

5272.patch (1.1 KB) - added by pishmishy 13 years ago.
Basic fix for this issue

Download all attachments as: .zip

Change History (26)

#1 @tzafrir
13 years ago

Oh, and on decent hours I even know how to spell WordPress :(

#2 @Viper007Bond
13 years ago

  • Keywords needs-patch added
  • Summary changed from Wodpress allows anonymous user to see slug for private post by guessing post number to WordPress allows anonymous user to see slug for private post by guessing post number

Luckily, you can fix it. :)

#3 @pishmishy
13 years ago

  • Owner changed from anonymous to pishmishy
  • Status changed from new to assigned

Confirming that the bug exists in trunk. Worth fixing as the slug may have been automatically derived from post data that the user didn't want to disclose.

13 years ago

Basic fix for this issue

#4 @pishmishy
13 years ago

  • Keywords has-patch canonical redirection private added; needs-patch removed

Fix is to add an additional condition to be satisfied before canonical redirection can take place.

Not entirely happy with my patch but it does fix the problem. Someone more familiar with query.php can probably come up with an is_private() function. is_empty works just as well though.

#5 @pishmishy
13 years ago

Tempted to close this one too. I think it's important to disclose as little information as possible but the fix has been on offer and there doesn't appear to be much demand for it.

#6 @tzafrir
13 years ago

Too bad - I can't see how this is not a major privacy issue.

If we ever want to see WordPress used as a CMS for a major corporation, we can't have their secret keynote surprise open for the world to see.

#7 @Denis-de-Bernardy
12 years ago

  • Keywords needs-patch added; has-patch canonical redirection private removed

The patch is invalid. There is some reprocessing of 404 code further down, that ends up not getting processed. Imo, what WP should do here is return a 403 error.

#8 @Denis-de-Bernardy
12 years ago

  • Milestone 2.9 deleted
  • Resolution set to wontfix
  • Status changed from assigned to closed

there's a dup of this one somewhere, and it shoud get wontfixed too.

#9 @peterwilsoncc
11 months ago

  • Component changed from General to Security
  • Keywords needs-unit-tests added
  • Milestone set to Future Release
  • Resolution wontfix deleted
  • Severity changed from major to normal
  • Status changed from closed to reopened

Reopening following discussion with @whyisjake.

This ticket was mentioned in PR #433 on WordPress/wordpress-develop by donmhico.

6 months ago

  • Keywords has-patch added; needs-patch removed

Prevent canonical redirect for private post.

Trac ticket: https://core.trac.wordpress.org/ticket/5272


  1. Unit test.
  2. Allow the redirect if user is logged and has permission to read the post.

#11 @donmhico
6 months ago

Added a patch above however it still need some work. Will try to update the PR soon.

#12 @donmhico
6 months ago

  • Keywords needs-testing added; needs-unit-tests removed

Updated the PR with unit tests. Need more people to test :)

#13 @SergeyBiryukov
6 months ago

  • Milestone changed from Future Release to 5.6
  • Owner changed from pishmishy to SergeyBiryukov
  • Status changed from reopened to reviewing

#14 @TimothyBlynJacobs
6 months ago

Should this be looking at get_post_status_object()->private?

This ticket was mentioned in PR #479 on WordPress/wordpress-develop by peterwilsoncc.

5 months ago

  • Keywords has-unit-tests added

#16 @prbot
5 months ago

peterwilsoncc commented on PR #433:


In parallel, I'd written some code elsewhere that I have added as PR #479 .

The code we'd written is similar so I'd make sure you get props.

There are few places in your patch that redirects are determined that had been missed, so I've expanded upon that to catch other places.

For the unit tests I expanded them to include both positive and negative use cases for all types of users, including the original author, you'll find them in the other PR.

If you think I have missed anything, please add comments.


#17 follow-up: @peterwilsoncc
5 months ago

As the friendly bot points out, I've pushed a PR to https://github.com/WordPress/wordpress-develop/pull/479

@TimothyBlynJacobs I've included a check for get_post_status_object( $redirect_obj->post_status )->public, do you think I should logic check for private or internal too?

@SergeyBiryukov I included some tests for comment feed requests but was getting some unexpected results with ?name=slug&feed=rss2 style requests that I think are unrelated to this ticket. Do you know if they work?

#18 in reply to: ↑ 17 @TimothyBlynJacobs
5 months ago

Replying to peterwilsoncc:

@TimothyBlynJacobs I've included a check for get_post_status_object( $redirect_obj->post_status )->public, do you think I should logic check for private or internal too?

I really don't know. I don't think it's valid for more than one of public, protected or private to be set to true. But since the function doesn't enforce that perhaps some developers have accidentally done that?

I guess the publicly_queryable post status arg might also be the thing to check? At a first glance, I can't find it being used anywhere in Core though.

#19 @whyisjake
3 months ago

In conversation with @dd32:

I’d personally lean towards get_post_status_object( $status )->public as the filterable way, but private isn’t a public post status.

#20 @peterwilsoncc
2 months ago

  • Resolution set to fixed
  • Status changed from reviewing to closed

In 49563:

Canonical: Prevent ID enumeration of private post slugs.

Add check to redirect_canonical() to ensure the destination post is not using a private post status.

Props dd32, Denis-de-Bernardy, donmhico, helen, nacin, peterwilsoncc, pishmishy, TimothyBlynJacobs, tzafrir, Viper007Bond, whyisjake.
Fixes #5272.

This ticket was mentioned in PR #745 on WordPress/wordpress-develop by peterwilsoncc.

2 months ago


Starting with some unit tests -- they fail.

#22 @peterwilsoncc
2 months ago

In 49622:

Permalinks: Prevent attachment pages 404ing following [49563].

This largely reverts [49563] due to attachment pages returning 404: File not found errors when they use the inherit status.

Permalink changes to attachment pages are retained when they are descendants of trashed or deleted posts.

Props Toro_Unit, helen, johnbillion, peterwilsoncc.
Fixes #51776.
See #5272.

#23 @peterwilsoncc
2 months ago

  • Milestone changed from 5.6 to Future Release
  • Resolution fixed deleted
  • Status changed from closed to reopened

#25 @peterwilsoncc
5 days ago

  • Keywords needs-testing removed
  • Milestone changed from Future Release to 5.7

Moving this on to the 5.7 milestone for another attempt. At time of writing tests are failing but hope to get it down soon.

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