WordPress WordPress Core Time-of-check Time-of-use (TOCTOU) Race Condition Vulnerability (CVE-2026-119977)
High · CVSS 8.1 (NVD) · fetched 2026-11-03 CISA KEV
WordPress WordPress Core contains a time-of-check time-of-use (TOCTOU) race condition vulnerability that could allow unauthenticated attackers to execute code on the server during the upgrade window. This is due to predictable, web-accessible staging paths used during full-package core upgrades.
Remediation
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes).
Affected PHP branches
See the source advisory.
Source: CISA Known Exploited Vulnerabilities Catalog · retrieved 2026-11-03T15:20:15-05:00 · https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json