If it's onload then simply viewing the image runs that script. Yikes.

lmao I'm so stupid I pressed on that image and now my account is compromised. oh well it forced to create another and this is my first hack yayyyyy!

Wtf how is this even possible? Are the Lemmy devs smoking crack? If you're going to run a reddit alternative, it may be wise to sanitize the fuck out of everything posted on there.

Wait, was that the one that had a community list well into the twenties? Or was that someone else? I don't think all that stuff reached me, but I did hear about a wannabe powermod like a week and a half ago. Much good that does anyone in a defederated system.

This used an onLoad which isn't generally shown when you hover over a link in a browser. Most people, even devs, aren't going to jump on the console to check every link.

NoScript would probably have helped though.

Here take this: 🙄

It’s worse than that. Until Lemmy is more mature, I would reccomend using the lite version of Lemmy, the JS-free version, for sake of client side security. Alternatively, or as an added point of security, the front-ends themselves should implement more sanitazion themselves. I’m willing to spend some free time vulnerability testing, but I would need a dedicated sand-box for that.

I have not seen any notice as to how either users or admins should mitigate the problem so far. Obviously, admins should update once a new release is out, but beyond that...

From an end-user standpoint, I would guess -- I have not looked at the code and have not been working on the security hole -- the following:

• This basically allows the attacker to masquerade as a currently-logged-in user who has viewed their link.

• Viewing content on a lemmy server while logged in as an admin right now is probably a particularly bad idea.

• I don't know what the full impact is for a regular user account, but it's probably possible for at minimum posts to be deleted, and posts to be made as someone. In kbin, my account shows my email address, so if lemmy does the same, it would be possible to link an email account used for registration with a username. If you used a throw-away email account that is publicly-accessible -- as I did -- that could allow for full account compromise.

• Viewing content while not logged in is probably safe -- maybe they can make Javascript run from a link, but without you being logged in, there isn't anything interesting that the attacker can do. If I were going to be viewing content on lemmy servers right now, and okay with being limited to lurking, I might do that for a few days until the issue is resolved and lemmy servers update.

• I don't know if kbin is vulnerable. It didn't accept the URL given in the bug as an example of a malicious URL when I tested submitting one, but it's possible that it trusts URLs coming from federated servers, which I did not check.

It IS intentionally down, post by the admins

I think you've never worked in software, or even used software, if you think paid close source apps don't have issues like this. They can be worse because they're written by interns and no one there actually cares, they just want their paycheck

yes and no: there are a couple of schools of thought!

of course, code by a lot of people without proper review is… risky

however, at least it’s able to be reviewed! and in time and with enough eyeballs, hopefully that code will become far more robust. that’s the benefit of transparency: anyone can review any line at any time!

remember: closed-source code as plenty of vulnerabilities too! just if we can’t review it, it’s much harder to work out what they might be… often, closed source vulnerabilities can exist for years without the vendor ever patching them because nobody is calling them out on it… hell, they can even know that their software is actively being exploited and just… not tell anyone