Vulnerability · Published Nov 3, 2026 · Assigned by Chrome
CVE-2026-121252
High 8.8
In plain English
A high-severity incorrect authorization in Chrome from Google. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.3%top 82.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Incorrect authorization in Core in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: Low)
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | chromium | no fix listed | DEBIAN-CVE-2026-121252 |
| Debian:13 | chromium | no fix listed | DEBIAN-CVE-2026-121252 |
| Debian:14 | chromium | no fix listed | DEBIAN-CVE-2026-121252 |
Affected products (as reported)
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H