A security researcher has released a working proof-of-concept (PoC) exploit for a recently patched vulnerability in Apple’s macOS operating system, raising concerns about potential attacks on unpatched systems. The flaw, tracked as CVE-2025-31258, was addressed in Apple’s latest macOS Sequoia 15.5 update, rolled out on May 12.
The vulnerability affects RemoteViewServices, a core macOS framework used for rendering content previews via features like Quick Look and remote document viewing. If exploited, it could allow malicious applications to escape the macOS sandbox, a key security feature that isolates apps to limit access to system resources and user data.
Just hours after the update went live, cybersecurity researcher Seo Hyun-gyu (known online as “wh1te4ever”) published a working PoC exploit on GitHub. In a post on X (formerly Twitter), the researcher described the project as “another 1day practice,” referring to the rapid development of an exploit after a fix is released but before widespread adoption of the patch.
Apple confirmed the issue in a security advisory, stating that a malicious application “may be able to break out of its sandbox,” and noted that the problem was resolved by “removing the vulnerable code.” The company also stated it had seen no evidence of active exploitation prior to the patch.
The public availability of the PoC has heightened urgency among security professionals, who are advising macOS users to update their systems immediately. The exploit demonstrates a “partial” sandbox escape, but even limited bypasses of the sandbox can open the door to more serious compromises if combined with other vulnerabilities.
This flaw was part of a broader security update from Apple, which patched several other components across macOS, including afpfs, AppleJPEG, CoreAudio, Kernel, and WebKit.
The disclosure follows a growing trend of “1day” exploit releases — proofs of concept published shortly after security patches — reinforcing the importance of timely system updates to stay ahead of potential threats.
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