Vulnerability · Published Nov 3, 2026 · Assigned by Chrome
CVE-2026-121031
Unrated
In plain English
A missing 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 0.2% (higher than 13% of all known vulnerabilities).
Severity (CVSS )–Not rated
Exploit odds (30 days)0.2%top 87.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Missing authorization in PDF in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to bypass web origin policy into a privileged page via a crafted Chrome extension. (Chromium security severity: Medium)
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | chromium | no fix listed | DEBIAN-CVE-2026-121031 |
| Debian:13 | chromium | no fix listed | DEBIAN-CVE-2026-121031 |
| Debian:14 | chromium | no fix listed | DEBIAN-CVE-2026-121031 |
Affected products (as reported)
Weakness: CWE-862