In T394522#10838447, @Xaosflux wrote:

There was a suggestion that the signature handler was being used to bypass some other control, if so please provide a bit more information on that which could be treated as a 'bug'.

If this is only about the broader request, "External links should not be allowed in the custom signature" that seems like a feature request that would need broader discussion.

The original user who brought up this problem, @Johnuniq, said he believed that this method of adding a link through the custom signature was used in the past to bypass the blacklist, and that’s what my comment was in reference to. I tried to look in the logs for past tickets, but I didn’t see couldn’t find any about that specific problem on here.

In T383053#10638929, @DavidEppstein wrote:

We have similar behavior being reported again at https://en.wikipedia.org/wiki/Wikipedia:SVG_help#Rendering_issue – is it the same bug?

Yes it is now working on all my devices. Thanks for the fix.

I'm using firefox but that's what it spit out.

HTTP/2 401
content-type: text/html; charset=UTF-8
content-length: 131
www-authenticate: Swift realm="AUTH_mw"
date: Mon, 06 Jan 2025 10:46:21 GMT
server: envoy
age: 0
x-cache: cp4047 miss, cp4047 pass
x-cache-status: pass
server-timing: cache;desc="pass", host;desc="cp4047"
strict-transport-security: max-age=106384710; includeSubDomains; preload
report-to: { "group": "wm_nel", "max_age": 604800, "endpoints": [{ "url": "https://intake-logging.wikimedia.org/v1/events?stream=w3c.reportingapi.network_error&schema_uri=/w3c/reportingapi/network_error/1.0.0" }] }
nel: { "report_to": "wm_nel", "max_age": 604800, "failure_fraction": 0.05, "success_fraction": 0.0}
x-content-type-options: nosniff
access-control-allow-origin: *
access-control-expose-headers: Age, Date, Content-Length, Content-Range, X-Content-Duration, X-Cache
timing-allow-origin: *
X-Firefox-Spdy: h2

The discussion was a little hard to understand, but it looks like they were talking about this thumbnail: https://en.wikipedia.org/wiki/File:Buick_Regal_2_--_10-30-2009.jpg
I have the same problem but when I click on the JPG previews of this file, I can see them. But I can't see it in the article.