Source not cited.
"In a statement obtained by Italian blog HDBlog.it, HTC said: "We recently received isolated reports of a purple colour that appears on the images taken with HTC One."
"According to Italian blog HDblog.it, HTC has acknowledged the issue and will be releasing a fix when it updates the phone’s software to Android 4.3 Jelly Bean in the near future. "
"According to Italian blog HDblog.it, HTC has acknowledged the issue and will be releasing a fix when it updates the phone’s software to Android 4.3 Jelly Bean in the near future."
"Italian blog HDBlog claims to have an email from HTC acknowledging the problem can occur if your HTC One's camera is faced with a "limited combination of conditions", a statement that HTC has confirmed to me today."
"Source: HDBlog"
"Now HTC has officially acknowledged the problem in an email reply to the Italian website HDBlog. The company says that the problem is caused by a specific combination of conditions and that it’s working on a software update to alleviate it."

With the exception of Android Origin, ALL of them cite their sources from one blog, and CNET claims to confirmed it with HTC, apparently. But as you can see, HTC DID NOT make ANY official statement. So it is merely a rumor mill that started off with HDBlog.it.

STOP SPREADING RUMORS.

I am a HTC One owner myself and I wish it was true that it is fixable via software but until HTC themselves make any statement, they are all just smoke and mirrors.