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.

Noye, 69, was convicted of murdering 21-year Stephen Cameron in an attack on the M25 in Kent in 1996.
Afterwards Noye went on the run and was arrested in Spain two years later.
In September 2015 the parole board refused to order his release but recommended he be transferred to an open prison, which was rejected by the then Justice Secretary Michael Gove.
Noye had argued Mr Gove's decision was "unlawful and irrational".
The challenge had been contested by the current Justice Secretary Liz Truss who said there was "nothing irrational" about Mr Gove's decision.
Mr Justice Lavender over-ruled the former justice secretary saying: "It will be for the current Secretary of State to take a fresh decision whether or not to transfer the claimant to an open prison."
Road rage killer Kenneth Noye has won a High Court battle to be moved to an open prison.

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Jamaica's Bolt has already won the 100m and is now aiming for an eighth Olympic gold by retaining his 200m title.
But American Gatlin, who won silver behind Bolt in the 100m final, only finished third in his semi-final.
Britain's Adam Gemili, 22, reached Thursday's final (02:30 BST, Friday) as one of two fastest losers.
Gatlin, 34, banned twice for doping offences, clocked 20.13 and failed to progress along with another big name - Yohan Blake.
The Jamaican, who won silver behind Bolt in London four years ago, has been hampered by injury over the past couple of years and faded to finish sixth in 20.37 seconds.
LaShawn Merritt, who has run 19.74 this year, is likely to pose the biggest challenge to Bolt in the final.
But Bolt believes he can break his world record of 19.19 and could even go under 19 seconds in the final.
"I definitely think I can try for the world record, I definitely feel that," he said. "I need to run efficiently and get into the straight and run the perfect race."
Bolt said he would have a better chance of achieving his goal to run under 19 seconds if he gets a high lane, adding: "If I get a lower lane it's always harder for me to run the corner when it is tighter."
On Gatlin's exit, Bolt told BBC Radio 5 live: "Everybody's in shock. You can tell from the 100m he's getting old. It's a fact the older you get, the rougher it gets to double.
"Next year if I go to the World Championships [in London] I'm not going to double. I'm going to do the 100m and that is it."
Listen: Bolt on his chances of setting a new world record
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Bolt has won all seven of his previous Olympic finals, claiming gold in the 100m, 200m and 4x100m relay at both Beijing 2008 and London 2012.
Here, the 29-year-old was laughing as he crossed the line just two hundredths of a second ahead of Canada's Andre de Grasse.
"Andre was supposed to slow down. He didn't," he joked.
"I said: 'What are you doing, it is the semis?' He said he had to push me.
"I was a bit lazy, I don't know why, but I executed it."
Day-by-day guide to what's on
Gatlin is a divisive figure in athletics, having returned to the sport after serving two bans.
He claimed Olympic bronze at London 2012 and silver behind Bolt in the 2015 World Championships.
After missing out on 100m gold on Sunday, he fell short in the 200m after appearing to lose focus when he glanced across the track 60 metres from the finish.
Gatlin, who ran 19.75 last month - the second fastest time of the year, said afterwards he had been hampered by an ankle injury.
"I'm happy to still be here for the relays," he said. "My ankle is giving me a lot of problems. I can't run properly and I had a tight turn in lane three."
Gemili, 22, was third in 20.08, with his place in the final confirmed following the third semi-final.
"I really tightened up. I'm in a lot better shape than 20.08. I was really disappointed seeing that," he said.
"But that's a good thing I suppose that I'm not satisfied with that and I will go and push on."
His team-mate Danny Talbot clocked a personal best 20.25, the same time as Nethaneel Mitchell-Blake, but it was not enough for either to go through.
The top two in each semi-final qualified automatically, along with the two fastest losers.
Michael Johnson, four-time Olympic gold medallist on BBC One:
"Adam Gemili got really tight at the end - his shoulders were up high and that makes it really tough.
"It was an interesting run by Usain Bolt, he got out fast and quick and let off a bit. De Grasse decided he was going to have a bit of fun and go and get him.
"Gatlin made a bit of a mistake. He relaxed. He didn't realise the others were upon him and then he tried to get back into it but you can't do that with the class of this field.
"That was a huge mistake and he will know it. A very strange race."
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Usain Bolt ran his fastest time of the season to win his Olympic 200m semi-final in 19.78 seconds as Justin Gatlin missed out on a place in the final.

