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High

Arbitrary Code Execution in Google Chrome WebShare on Mac

IdentifiersCVE-2026-8517CWE-664· Improper Control of a Resource…

CVE-2026-8517 is a critical object lifecycle issue in the WebShare component of Google Chrome on macOS. It affects Chrome versions prior to 148.0.7778.168. According to the provided content, a remote attacker can trigger the flaw by serving a crafted HTML page and inducing the victim to perform specific UI gestures. The vulnerability is classified under CWE-664, indicating improper control of a resource through its lifetime. Successful exploitation can result in arbitrary code execution in the browser context.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows arbitrary code execution. The provided CVSS v3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) indicates high impact to confidentiality, integrity, and availability. In practical terms, exploitation could allow an attacker to execute attacker-controlled code within the Chrome process on a vulnerable Mac system after user interaction with a malicious page.

Mitigation

If you can’t patch tonight, do this now.

Until patching is completed, reduce exposure by limiting access to untrusted websites and preventing users from interacting with suspicious or attacker-controlled HTML content that may request or rely on WebShare-related UI flows. Because exploitation requires specific UI gestures, user-awareness measures and restricting browsing to trusted content may reduce risk, but these are not substitutes for updating to the fixed version.

Remediation

Patch, then assume compromise.

Update Google Chrome on macOS to version 148.0.7778.168 or later. The provided content identifies versions prior to 148.0.7778.168 as vulnerable. Applying the vendor-issued stable channel update is the primary remediation.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
GoogleChromeapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

6 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity2

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-8517
NVD
nvd.nist.gov/vuln/detail/CVE-2026-8517
MITRE CWE · CWE-664
Improper Control of a Resource Through its…
Vendor Advisory
chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
Permissions Required
issues.chromium.org/issues/497531263