A botched security fix released for the Java software framework 30 months ago has left millions of users vulnerable to attacks that Oracle had claimed were no longer possible, a security researcher said.

The bypass code, which was released Thursday by Polish security firm Security Explorations, contains only minor changes to the original proof-of-concept, according to an e-mail posted to the Full Disclosure security list. Security Explorations released the original exploit in October 2013 following the release of a patch from Oracle. Thursday’s bypass changes only four characters from the 2013 code and uses a custom server to work. The bypass means that millions of Java users have remained vulnerable to the flaw, categorized as CVE-2013-5838, despite assurances from Oracle that the attacks were no longer possible.

“We implemented a Proof of Concept code that illustrates the impact of the broken fix described above,” Security Explorations researchers wrote in a report. “It has been successfully tested in the environment of Java SE Update 97, Java SE 8 Update 74, and Java SE 9 Early Access Build 108. In all cases, a complete Java security sandbox escape could be achieved.”

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Botched Java patch leaves millions vulnerable to 30-month-old attack