PT-2025-27671 · Google · Google Chrome

Ari Novick · Published 2025-07-02 · Updated 2025-07-02 · CVE-2025-34090

Positive Technologies (AI Summary)

CVSS v4.0

9.3

Critical

Base vector

AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions: Google Chrome (affected versions not specified)

Description: A security bypass issue exists in the AppBound cookie encryption mechanism of Google Chrome due to insufficient validation of COM server paths during inter-process communication. This allows a local low-privileged attacker to hijack the COM class identifier (CLSID) registration used by Chrome's elevation service, pointing it to a non-existent or malicious binary. As a result, Chrome falls back to the legacy cookie encryption mechanism, enabling cookie decryption by any user-context malware without SYSTEM-level access. This flaw bypasses the intended protections of the AppBound encryption design, allowing cookie theft from Chromium-based browsers.

Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Untrusted Search Path

Incorrect Default Permissions

Weakness Enumeration

CWE-426

CWE-276

Related Identifiers

BDU:2025-09939

CVE-2025-34090

Affected Products

Google Chrome

References · 8

• https://bdu.fstec.ru/vul/2025-09939 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-34090 · Security Note
• https://cve.org/CVERecord?id=CVE-2025-34090 · Security Note
• https://twitter.com/VulmonFeeds/status/1940540114490311074 · Twitter Post
• https://twitter.com/CVEnew/status/1940495177690337403 · Twitter Post
• https://vulncheck.com/advisories/google-chrome-appbound-cookie-encryption · Note
• https://twitter.com/xvonfers/status/1940505749073154086 · Twitter Post
• https://cyberark.com/resources/threat-research-blog/c4-bomb-blowing-up-chromes-appbound-cookie-encryption · Note