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PSA: Do not enable URL thumbnail generation in Element (lemm.ee)

submitted 1 year ago* (last edited 1 year ago) by Kalcifer@lemm.ee to c/privacy@lemmy.ml

24 comments fedilink hide all child comments

As I noted within my post, #9955859@lemm.ee (alternate link), URL thumbnail generation in Element is an enormous privacy, and security vulnerability. Thumbnails are generated server-side, regardless of E2EE settings. What this means is that the URLs that one sends would be leaked out of your encrypted chats to the server. Here is a notable excerpt from the settings within Element:

In encrypted rooms, like this one, URL previews are disabled by default to ensure that your homeserver (where the previews are generated) cannot gather information about links you see in this room.

Post Edit History

2023-10-02T00:54Z
1c1,2
&lt; As I noted within my post #9955859@lemm.ee ([alternate link](https://lemm.ee/post/9955859)), thumbnail generation in [Element](https://element.io/) is an enormous privacy, and security vulnerability. Thumbnails are generated server-side, regardless of E2EE settings. What this means is that the URLs that one sends would be leaked out of your encrypted chats to the server.
***
> As I noted within my post #9955859@lemm.ee ([alternate link](https://lemm.ee/post/9955859)), thumbnail generation in [Element](https://element.io/) is an enormous privacy, and security vulnerability. Thumbnails are generated server-side, regardless of E2EE settings. What this means is that the URLs that one sends would be leaked out of your encrypted chats to the server. Here is a notable excerpt from the settings within Element:
> > In encrypted rooms, like this one, URL previews are disabled by default to ensure that your homeserver (where the previews are generated) cannot gather information about links you see in this room.

2023-10-02T01:28Z
1,2c1,2
&lt; As I noted within my post #9955859@lemm.ee ([alternate link](https://lemm.ee/post/9955859)), thumbnail generation in [Element](https://element.io/) is an enormous privacy, and security vulnerability. Thumbnails are generated server-side, regardless of E2EE settings. What this means is that the URLs that one sends would be leaked out of your encrypted chats to the server. Here is a notable excerpt from the settings within Element:
&lt; > In encrypted rooms, like this one, URL previews are disabled by default to ensure that your homeserver (where the previews are generated) cannot gather information about links you see in this room. 
***
>  As I noted within my post, #9955859@lemm.ee ([alternate link](https://lemm.ee/post/9955859)), thumbnail generation in [Element](https://element.io/) is an enormous privacy, and security vulnerability. Thumbnails are generated server-side, regardless of E2EE settings. What this means is that the URLs that one sends would be leaked out of your encrypted chats to the server. Here is a notable excerpt from the settings within Element:
> > In encrypted rooms, like this one, URL previews are disabled by default to ensure that your homeserver (where the previews are generated) cannot gather information about links you see in this room.

2023-10-02T03:44Z
1c1
&lt; As I noted within my post, #9955859@lemm.ee ([alternate link](https://lemm.ee/post/9955859)), thumbnail generation in [Element](https://element.io/) is an enormous privacy, and security vulnerability. Thumbnails are generated server-side, regardless of E2EE settings. What this means is that the URLs that one sends would be leaked out of your encrypted chats to the server. Here is a notable excerpt from the settings within Element:
***
> As I noted within my post, #9955859@lemm.ee ([alternate link](https://lemm.ee/post/9955859)), URL thumbnail generation in [Element](https://element.io/) is an enormous privacy, and security vulnerability. Thumbnails are generated server-side, regardless of E2EE settings. What this means is that the URLs that one sends would be leaked out of your encrypted chats to the server. Here is a notable excerpt from the settings within Element:

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[–] Kalcifer@lemm.ee 1 points 1 year ago* (last edited 1 year ago) (1 children)

Indeed, it does. It can be overlooked, however. I added that info to my post, though. Thank you for the note.

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[–] golfguide_jacobite@artemis.camp 1 points 1 year ago (1 children)

With my friend we have a bot who does this for us. Check out on maubot - at least it is mot client side work

[–] Kalcifer@lemm.ee 1 points 1 year ago* (last edited 1 year ago)

Using a bot to generate a URL preview is an interesting workaround.

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