On the German-language Wikipedia's VisualEditor feedback page it was brought to our attention today that in several cases editors using the VisualEditor added to an article what looks to me like a directly-pasted image file:

[[data:image/png;base64,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|verweis=javascript:]]

Note that in many, but not all cases it is the same code as above which is inserted.

The following cases were reported today:

- https://de.wikipedia.org/wiki/Spezial:Diff/173428398/174971828
- https://de.wikipedia.org/wiki/Spezial:Diff/174537672
- https://de.wikipedia.org/wiki/Spezial:Diff/174798163
- https://de.wikipedia.org/wiki/Spezial:Diff/175076832
- https://de.wikipedia.org/wiki/Spezial:Diff/175111657
- https://de.wikipedia.org/wiki/Spezial:Diff/175540354
- https://de.wikipedia.org/wiki/Spezial:Diff/175704341
- https://de.wikipedia.org/wiki/Spezial:Diff/175704688
- https://de.wikipedia.org/wiki/Spezial:Diff/175719654
- https://de.wikipedia.org/wiki/Spezial:Diff/175796590
- https://de.wikipedia.org/wiki/Spezial:Diff/176290503
- https://de.wikipedia.org/wiki/Spezial:Diff/176448060
- https://de.wikipedia.org/wiki/Spezial:Diff/176529517
- https://de.wikipedia.org/wiki/Spezial:Diff/176596385
- https://de.wikipedia.org/wiki/Spezial:Diff/176596385

Two cases from the English-language Wikipedia: