Thanks Tim,

1. Does “saw the site” mean users actually had full or partial access to
the accounts of other users, or simply were viewing a cached version of the
site that appeared as if they were logged in as someone else? How many
users were impacted?

2. Does the WMF hold incident review meetings and publish reports about
what steps are taken to prevent repeat incidents with the same root cause?

On Thu, Jun 25, 2020 at 7:44 PM Tim Starling <>

> Everyone on Wikimedia wikis will shortly be logged out and will have
> to log back in again.
> We are resetting all sessions because we believe that, due to a
> configuration error, session cookies may have been sent in cacheable
> responses. Some users reported that they saw the site as if they were
> logged in as someone else. We believe that the number of affected
> users was very small. However, we believe that resetting all sessions
> is a prudent measure to ensure that the impact is limited.
> There are several layers of protection against something like this
> happening, and we don't yet know how all of them failed, but we have
> made a configuration change which should be sufficient to prevent it
> from happening again.
> -- Tim Starling
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