Federal cybersecurity authorities have formally updated the Known Exploited Vulnerabilities catalog under Binding Operational Directive 22-01, issuing an emergency patch mandate for a widespread content management system flaw. Unauthenticated remote adversaries actively weaponize a race condition timing window during automated core background updates to achieve remote code execution on target web host servers.
The catalog addition features WordPress Core vulnerability CVE-2026-119977. The defect involves a time-of-check time-of-use TOCTOU race condition in core file updating handlers. Unauthenticated remote adversaries transmit crafted concurrent HTTP requests during the exact execution window of a core software upgrade, overwriting temporary system files and executing arbitrary PHP code under the web daemon context. Security telemetry confirms threat actors using automated scanning toolkits to monitor exposed sites and trigger race execution payloads during update routines.
Subverting central content management systems exposes web hosting infrastructure, customer databases, and corporate public web portals. Because WordPress powers significant portions of public enterprise web infrastructure, an unauthenticated update race condition compromise permits threat actors to deploy web shell backdoors, dump database records, and pivot into internal subnets.
– Enforce immediate update deployment across all self-hosted WordPress installations to ensure current maintenance builds are applied.
– Restrict file system write permissions across public web hosting directories during core software update cycles.
– Monitor web server HTTP access logs for high-frequency concurrent requests targeting background update endpoints.
– Isolate web application hosting nodes behind web application firewalls configured to inspect malformed PHP upload streams.
Web platform defense requires rapid core update deployment and strict directory write isolation to ensure web hosting infrastructure remains protected against update-window race condition exploits. #CodeDefence #WordPress #RCE #TOCTOU #RaceCondition #CISA #KEV #AppSec #PatchManagement #WebSecurity
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