Path: csiph.com!feeder.erje.net!1.eu.feeder.erje.net!news.unit0.net!weretis.net!feeder1.news.weretis.net!news.solani.org!.POSTED!not-for-mail From: "Christoph M. Becker" Newsgroups: comp.lang.javascript Subject: Re: Javascript injection Date: Mon, 29 Aug 2016 11:27:34 +0200 Organization: solani.org Lines: 9 Message-ID: References: <2a5cf91a-151b-4379-9510-5dcd5a5bb196@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Trace: solani.org 1472462846 7780 eJwFwQkBACAIA8BKyCfGweH6R/AuLFdie0Z6MFhnSt80W2rkEvMgPYUD6D3irgvG3Ow0bXxCZRJI (29 Aug 2016 09:27:26 GMT) X-Complaints-To: abuse@news.solani.org NNTP-Posting-Date: Mon, 29 Aug 2016 09:27:26 +0000 (UTC) User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 X-User-ID: eJwNwokRACEIBLCWDuTZLUcR+i/Bm8RXSFRaeJjPjwldvSn4pCAdGO9S0nVTz7WUk5hbBuP0AwfoEMc= In-Reply-To: <2a5cf91a-151b-4379-9510-5dcd5a5bb196@googlegroups.com> Cancel-Lock: sha1:emZZ1uT4P9S/c1PUigWqAvvGGUw= X-NNTP-Posting-Host: eJwFwYERwEAIArCVCirOw+m7/whNKgRNp0pZV3cWQBoZy9TbGLrD/b0WHpHbXKfH0Vf6ARLAEOQ= Xref: csiph.com comp.lang.javascript:31204 On 29.08.2016 at 07:58, bit-naughty@hotmail.com wrote: > If I have a "forum" type of site, where stuff is being posted, and stored in the backend (in a MySQL database, using PHP), say,....can anyone type in Javascript into the post to accomplish naughty things? What's the most nefarious thing anyone can do? All I can think of is that someone would deface the page somehow, that *that* post is on, which, really, I can't see the point of..... Anything else? > ...and how do I protect against it? (the post will probably be displayed inside a DIV on the page, I think....) I suggest you read about Cross-Site-Scripting (XSS), for a start. -- Christoph M. Becker