Google Chrome: Memory corruption in FedCM allows sandboxed code execution
Summary
Google Chrome prior to 156.0.8078.47 contains a memory corruption flaw in the FedCM (Federated Credential Management) web API. A remote attacker can use a crafted HTML page to potentially execute arbitrary code inside the browser sandbox. The attack requires that a user visits the malicious page, and the sources do not describe a sandbox escape.
Affected
- Google Chrome (desktop, Windows, macOS, Linux) prior to 156.0.8078.47
Fixed in
- Google Chrome 156.0.8078.47 or later (newer 156.x stable builds include the fix)
- Distribution builds of Chromium, such as Debian DSA 6577-1 and DLA 4853-1, as issued by the respective vendors
- Microsoft Edge: fix according to Microsoft's update guide (version not verified)
Workaround
- Unknown. No workaround is documented in the sources.
Exploitation
- No exploitation in the wild reported in the sources.
- No public proof of concept found.
- CISA KEV status: Unknown.
- CISA SSVC: Exploitation none, Automatable no, Technical impact total.
Our recommendation
- Update all Chrome, Chromium and Edge installations to 156.0.8078.47 or the newest 156.x stable build.
- Make sure users restart the browser so the update takes effect.
- Check centrally managed browser versions and enforce automatic updates.
- Treat unexpected links and crafted web pages as a phishing risk and monitor for outdated browser versions.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Chrome Releases: Stable Channel Update for Desktop chromereleases.googleblog.com
- Chromium issue tracker 507227196 issues.chromium.org
- Microsoft Security Update Guide CVE-2026-113183 msrc.microsoft.com
- NVD record via Vulners vulners.com
- Debian Security Advisories via Vulners vulners.com
- Ubuntu security tracker CVE-2026-113183 ubuntu.com
- HKCERT Microsoft Edge security bulletin www.hkcert.org
- VulDB entry 424537 vuldb.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 13:11.
Original description (NVD)
Memory corruption in FedCM in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to potentially execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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