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CVE-2019-5840 is an incorrect security UI vulnerability in Google Chrome on iOS prior to version 75.0.3770.80. The flaw allowed a crafted HTML page to bypass Chrome’s popup-blocking and navigation restrictions. Observed exploitation showed that the issue could be triggered from advertising content rendered inside sandboxed iframes commonly used in ad-serving environments, where a user tap on the parent page could still cause Chrome on iOS to open a popup despite sandbox parameters intended to constrain such behavior. This weakened browser-enforced protections designed to prevent unsolicited popups and forced redirects.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Chrome on iOS vulnerability used by the eGobbler malvertising actor to bypass Chrome’s built-in pop-up blocker (including within sandboxed ad iframes), enabling unwanted pop-ups/forced redirections at scale.
A Chrome browser vulnerability reportedly used by eGobbler to bypass popup blocking and iframe sandboxing protections in support of forced-redirect malvertising.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.