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Medium

Same-Origin Policy Bypass in Google Chrome Service Worker

IdentifiersCVE-2026-9115CWE-284

CVE-2026-9115 is a high-severity insufficient policy enforcement vulnerability in the Service Worker component of Google Chrome. According to the provided content, Chrome versions prior to 148.0.7778.179 improperly enforced security policy boundaries, allowing a remote attacker to bypass the browser same-origin policy by convincing a target to load a crafted HTML page. The issue is described by Google/Chromium as insufficient policy enforcement in Service Worker; no more specific vulnerable function or code path is provided in the available material.

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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 bypass of the browser same-origin policy in affected Chrome versions. This can enable unauthorized cross-origin access within the browser security context, potentially exposing sensitive data from other origins or enabling actions that should be restricted by origin isolation. The provided content does not specify further downstream impact beyond same-origin policy bypass.

Mitigation

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

If immediate patching is not possible, reduce exposure by limiting use of untrusted websites and preventing users from opening attacker-controlled or untrusted HTML content in affected Chrome versions. Enterprise defenders can apply temporary browser hardening and web access controls to reduce delivery of crafted pages, but no vendor-specific workaround or feature-disable mitigation is provided in the available content. Patching remains the primary mitigation.

Remediation

Patch, then assume compromise.

Update Google Chrome/Chromium to version 148.0.7778.179 or later on affected platforms. The provided content indicates the issue affects Google Chrome prior to 148.0.7778.179 and was addressed in the Chrome Stable channel 148.0.7778.178/179 release series. Standard remediation is to deploy the vendor-fixed version across managed endpoints and ensure browsers are restarted so the patched build is active.
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

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

3 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 activity

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-9115
NVD
nvd.nist.gov/vuln/detail/CVE-2026-9115
MITRE CWE · CWE-284
cwe.mitre.org
Vendor Advisory
chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0841193308.html
Permissions Required
issues.chromium.org/issues/495999481