CVE entry · CVE-2026-119977
CVE-2026-119977: WordPress WordPress Core Time-of-check Time-of-use (TOCTOU) Race Condition Vulnerability
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.
- Actively exploited: added to CISA’s KEV catalog on November 3, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: November 6, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes WordPress Core, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.
References
- Vendor advisory or reference cited by CISA (wordpress.org)
- Vendor advisory or reference cited by CISA (www.wordfence.com)
- NVD entry (NIST)
- CISA KEV catalog