In this task, you are given an article. Your task is to summarize the article in a sentence.

The vulnerability might leave users open to stalking, harassment or persecution, said the researchers.
By spoofing requests to the servers behind the apps, researchers were able to track people as they moved around during the day.
One app maker has fixed the loopholes in some nations but most users are still at risk, they warned.
The location-leaking vulnerabilities were found by Colby Moore and Patrick Wardle from cybersecurity firm Synack. The pair focused most of their attention on gay dating app Grindr but said other dating apps were vulnerable in the same way.
They found that they could exploit a feature of Grindr that tells users how far away they are from other people who have signed up to use the service and share where they are. The app calls on several different sources of data to provide very precise measurements of this distance.
To exploit the loophole the researchers sent several requests to servers behind Grindr, each one appearing to come from a different location. This let them get multiple estimates of a target's distance from these separate places. This made it possible to calculate a person's exact location by triangulation.
In a presentation at the Shmoocon conference, Mr Colby showed how he was able to use the loophole to map all Grindr users in San Francisco's Bay Area and those at the Sochi winter Olympics. Correlating this location data with information from social media sites would make it easy to find out someone's identity, he said.
While exploiting the loophole was not straightforward, said the researchers, there was evidence that it was being abused in Egypt to harass some dating app users.
He said Synack had told Grindr about the vulnerability which prompted the firm to update versions of its app available in nations where homosexuality is illegal or which have a history of violence against gay people.
It added that it had made it easy for people to stop sharing their location if they were worried about how it could be abused.
In a blogpost published soon after it was told about the problem, Grindr said that it had no plans to change the location finding system in nations where it was used because it was a "core function" of the service rather than a security flaw.
As a result, Mr Moore told tech news site Ars Technica, the problem still existed for Grindr users outside nations where location sharing was turned off.
"We were able to replicate this attack multiple times on willing participants without fail," he said.
He said Grindr could make it much harder to exploit the bug by checking where people were making location requests from and stopping those that were obviously spoofed. In addition, he said, the firm could make the location data less precise to help obscure people's locations.
Many mobile dating apps can be hacked to expose the exact location of users, warn security experts.

Australia batsman Handscomb hit eight fours and six sixes on his way to a first List A century at Headingley as Yorkshire posted 349-7 in 50 overs.
Handscomb put on 156 with captain Gary Ballance, who made 63 for the hosts.
Wayne Madsen hit 112 and wicketkeeper Daryn Smit 77 not out in Derbyshire's reply, but they ended on 334-8.
Madsen's fourth one-day hundred came off 96 balls, but Yorkshire's sizeable total was rarely under serious threat until Smit and Matt Critchley, who made 49 off 21 balls, got them close with a flurry of late boundaries.
Critchley hit four sixes before falling to seamer Ben Coad (4-63) one run short of his first List A half-century.
Yorkshire have won four of their first five group matches, in no small part thanks to Handscomb, who is the leading scorer in the One-Day Cup with 407 runs from his five innings.
Yorkshire now travel to Northampton on Wednesday, when Derbyshire are due to host One-Day Cup holders Warwickshire.
Yorkshire batsman Peter Handscomb told BBC Radio Leeds:
"It's nice to get out there at number four and stamp some authority on the game. My one-day role in previous years has been coming in at five and six.
"It can be quite tough from there. I knew I hadn't got a century, but it wasn't something that was eating away at me.
"We bowled well. 350 was going to be a large total to chase down. Credit to the boys, we assessed the conditions and stuck to our lengths."
Derbyshire wicketkeeper Daryn Smit told BBC Radio Derby:
"To think how close we got and what a good effort it was, we can be proud.
"But, if we look back at our last few games, we can be proud of a lot of our performances. We just haven't got the results to show for it.
"Without being disrespectful, it's getting a bit frustrating. We need to start turning those into results."
Peter Handscomb's 140 off 112 balls helped Yorkshire to a 15-run victory over Derbyshire, which took the Tykes top of the One-Day Cup North Group.

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McLaren passed away at the age of 86 in 2010.
Throughout his distinguished career he earned the respect of players, fans and spectators by being the best-researched commentator rugby had ever seen.
Watch Scotland v France live on BBC One, BBC One HD, online, tablets, mobiles and BBC Sport app from 1330 GMT, Sunday 13 March; listen on BBC Radio 5 Live Sports Extra; text commentary on BBC Sport website.

BBC Rewind pays tribute to legendary commentator Bill McLaren who became known as "the voice of rugby".

