Subject that are "too long" get cut if they use predominately "wide" characters

[kopipe]

And an ampersand gets put at the end, at least in one case, perhaps pointing to an issue where HTML entities are being considered and not the actual text I entered.

I made a thread with subject 【簡単に稼げる】Google Play日本版でふしぎの国のアリス(日本語吹替版のみ!)を購入して私に送ってください。ビットコインで４千円の手数料をお支払いします in the 日本語 (Japanese) forum: link.

It got cut down to:

【簡単に稼げる】Google Play日本版でふしぎの国のアリス(日本語吹替版のみ!)を&

 

I imagine this is a known issue, but that little & scares me, makes me think XSS might be possible by someone smarter than me, if they combined this bug with other bugs I don't know about. Please look into this.

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[GazetaBitcoin]

As far as I know, there is a certain number of characters for topic titles and thos fixed number can't be extended. However, when using regular characters, you are not allowed to make a title longer than the allowed number of characters. I never heard about writing a long topic title, exceeding the allowed number of characters, and being cut afterwards. If others have more knowledge, I'd also like to hear more opinions.

[AB de Royse777]

The current character limit is 80 characters for a topic title and 84 characters for a topic reply title. In the topic reply title the additional four characters are used for "Re: " but if you want you can use this addition four character space with whatever you want.

I have tested it on this topic: https://ninjastic.space/topic/5299629 (sorry mod for this extra job, I was too curious LOL)

However, in the default SMF the limit is 255 characters. Read this please: https://www.simplemachines.org/community/index.php?topic=436723.0

Update:
It seems your issue is not in character count. I checked the number of characters which is 80 for the following title:

【簡単に稼げる】Google Play日本版でふしぎの国のアリス(日本語吹替版のみ!)を購入して私に送ってください。ビットコインで４千円の手数料をお支払いします

But the remaining characters after the cut off is 45 characters:

【簡単に稼げる】Google Play日本版でふしぎの国のアリス(日本語吹替版のみ!)を&

I think when the characters are counting by the system for the local language then it's messing up with it's unicode.

[DooMAD]

The current character limit is 80 characters for a topic title and 84 characters for a topic reply title. In the topic reply title the additional four characters are used for "Re: " but if you want you can use this addition four character space with whatever you want.

I have tested it on this topic: https://ninjastic.space/topic/5299629 (sorry mod for this extra job, I was too curious LOL)

However, in the default SMF the limit is 255 characters. Read this please: https://www.simplemachines.org/community/index.php?topic=436723.0

I think what the OP is saying is that their title got cut to 45 characters and then places an '&' at the end.  Their concern is that the '&' might have the potential to be used in a cross-site scripting attack.  I'm not a code guy, so I don't know if such a threat is real or not.


//EDIT:  Ah, you edited.