CISA Confirms Hackers Exploiting WordPress Core Flaw During Software Upgrades

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added a security flaw in WordPress Core to the Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation. The high-severity vulnerability, tracked as CVE-2026-119977 (CVSS score: 8.1), is a Time-of-check Time-of-use (TOCTOU) race condition that could be exploited to achieve arbitrary code execution. Federal agencies must patch by December 1.