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Same-origin policy bypass in Google Chrome DeviceBoundSessionCredentials

IdentifiersCVE-2026-13021CWE-284

CVE-2026-13021 is a high-severity inappropriate implementation vulnerability in DeviceBoundSessionCredentials in Google Chrome prior to 149.0.7827.197. According to the provided advisory text, a remote attacker can trigger the issue using a crafted HTML page, resulting in a bypass of the browser same-origin policy. The available source material does not provide vulnerable function-level details or a root-cause patch analysis beyond identifying the affected component as DeviceBoundSessionCredentials and classifying the flaw as an inappropriate implementation.

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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 a remote attacker to bypass Chrome’s same-origin policy. This can undermine browser-enforced origin isolation and may permit unauthorized cross-origin access or interactions that should normally be blocked, potentially exposing sensitive data from other origins or enabling restricted web actions in the victim’s browser context. The provided content does not supply more specific post-exploitation constraints or demonstrated exploit outcomes.

Mitigation

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

Apply vendor security updates as soon as possible. Until patched versions are deployed, reduce exposure by limiting use of untrusted websites and crafted HTML content in affected Chrome/Chromium installations. No specific workaround or feature-disable mitigation was provided in the supplied advisories.

Remediation

Patch, then assume compromise.

Upgrade Google Chrome to version 149.0.7827.197 or later. For Chromium on Debian stable (trixie), upgrade to 149.0.7827.196-1~deb13u1 or a later patched package provided by Debian. Chromium-based downstream products should also be updated once vendor patches are available.
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
DebianChromiumapplication
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-2026-13021
NVD
nvd.nist.gov/vuln/detail/CVE-2026-13021
MITRE CWE · CWE-284
cwe.mitre.org