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Site Isolation Bypass in Google Chrome File System Access

IdentifiersCVE-2026-12460CWE-693

CVE-2026-12460 is a high-severity insufficient policy enforcement vulnerability in the File System Access component of Google Chrome prior to 149.0.7827.155. According to the provided content, a remote attacker who had already compromised the renderer process could use a crafted PDF file to bypass Chrome site isolation. The issue is described by Chromium as insufficient policy enforcement in File System Access, indicating that security boundaries or restrictions intended to constrain renderer-origin access were not properly enforced when processing the malicious PDF-driven scenario.

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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 an attacker with prior renderer-process compromise to bypass Chrome's site isolation protections. This weakens browser security boundaries between sites and can enable cross-site access that should normally be prevented. In the broader context of exploit chains, this can facilitate security restriction bypass, sensitive information disclosure, and post-compromise expansion of attacker capabilities within the browser.

Mitigation

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

No specific temporary workaround is provided in the supplied advisories. Mitigation is primarily to update affected browsers promptly. As defense in depth, reduce exposure to malicious web content and crafted PDF files, monitor enterprise environments for outdated Chrome/Chromium/Edge versions, and apply browser isolation or endpoint protections where available.

Remediation

Patch, then assume compromise.

Upgrade Google Chrome to version 149.0.7827.155 or later. For Chromium on Debian, upgrade to 149.0.7827.155-1~deb13u1 on Debian stable (trixie) or 149.0.7827.155-1~deb12u1 on Debian oldstable (bookworm). For Microsoft Edge (Chromium-based), upgrade to version 149.0.4022.80 or later, which incorporates the upstream Chromium fix.
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 activity1

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-12460
NVD
nvd.nist.gov/vuln/detail/CVE-2026-12460
MITRE CWE · CWE-693
cwe.mitre.org