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Site isolation bypass in Google Chrome Passwords

IdentifiersCVE-2026-13034CWE-693

CVE-2026-13034 is a high-severity inappropriate implementation vulnerability in the Passwords component of Google Chrome prior to 149.0.7827.197. According to the provided advisory text, a remote attacker who had already compromised the renderer process could use a crafted HTML page to bypass Chrome site isolation protections. The issue is described only at a high level, with no vulnerable function or code path disclosed in the provided material. The flaw affects Chrome’s security boundary enforcement rather than being described as a memory-corruption bug.

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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 who already controls a compromised renderer process to bypass site isolation, weakening Chrome’s cross-site security boundaries. This could enable unauthorized access to data or contexts that should remain isolated between sites, increasing the risk of information disclosure and facilitating further post-compromise browser exploitation.

Mitigation

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

No specific workaround is provided in the supplied content. The practical mitigation is to apply the vendor security update as soon as possible. Reducing exposure also depends on preventing initial renderer compromise, since exploitation requires the renderer process to already be compromised.

Remediation

Patch, then assume compromise.

Upgrade Google Chrome to version 149.0.7827.197 or later. For Linux distributions and downstream Chromium-based packages, apply the vendor-provided patched builds, such as Debian chromium 149.0.7827.196-1~deb13u1 or later where applicable. Because Chromium-based browsers may share the affected codebase, corresponding updates from downstream vendors should also be applied promptly.
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-2026-13034
NVD
nvd.nist.gov/vuln/detail/CVE-2026-13034
MITRE CWE · CWE-693
cwe.mitre.org