Drupal to Release Urgent Core Security Updates on May 20, Sites Told to Prepare  Ravie Lakshmanan  May 19, 2026 Vulnerability / Website Security Drupal has issued an alert stating that it intends to release a "core security release" for all supported branches on May 20, 2026, from 5-9 p.m. UTC. "The Drupal Security Team urges you to reserve time for core updates at that time because exploits might be developed within hours or days," the maintainers of the PHP-based content management system (CMS) said . "Not all configurations are affected. Reserve time on May 20 during the release window to determine whether your sites are affected and in need of an immediate update. Mitigation information will be included in the advisory." It's being advised to update to the latest supported patch for the site's version of Drupal before the deadline so that any outstanding upgrade issues can be addressed. Patches are expected to be available for the following supported branches of Drupal core - 11.3.x 11.2.x 10.6.x 10.5.x "Sites on one of these supported versions should update to the latest patch release for the given branch now in preparation for the security window," Drupal said. The exact nature of the security issue being addressed is unknown at this stage, but it's expected to be severe given that Drupal is providing 11.1.x and 10.4.x releases for sites running end-of-life minor core versions. Ahead of the planned update window - Sites on Drupal 11.1 or 11.0 should update to at least Drupal 11.1.9. Sites on Drupal 10.4, 10.3, 10.2, 10.1, or 10.0 should update to at least Drupal 10.4.9. The idea is that these sites should apply the security update as soon as it is released on May 20, and then upgrade to Drupal 11.3 or 10.6 in the near future. For sites still on end-of-life major core versions, such as Drupal 8 and 9, patch files for Drupal 8.9 and 9.5 will need to be applied manually. However, Drupal has warned that there is no guarantee the fixes will work correctly, adding that they may introduce other issues or regressions. "However, they may help mitigate the vulnerability for sites still on these old major versions until they upgrade to a supported release," Drupal said. "We strongly recommend Drupal 8 or 9 sites update to at least Drupal 10.6 soon. Drupal 8 and 9 include numerous other, previously disclosed, security vulnerabilities that will not be addressed by either Drupal Steward or the best-effort patch files." Drupal also noted that Drupal 7 is not affected by the issue. Sites on any version of Drupal 9 are advised to update to 9.5.11, and those on any version of Drupal 8 should update to Drupal 8.9.20. Found this article interesting? Follow us on Google News , Twitter and LinkedIn to read more exclusive content we post. SHARE      Tweet  Share  Share  Share   Share on Facebook  Share on Twitter  Share on Linkedin  Share on Reddit  Share on Hacker News  Share on Email  Share on WhatsApp Share on Facebook Messenger  Share on Telegram SHARE  content management system , cybersecurity , Drupal , End Of Life , PHP , Security patch , Vulnerability , Website Security ⚡ Top Stories This Week Ollama Out-of-Bounds Read Vulnerability Allows Remote Process Memory Leak Four OpenClaw Flaws Enable Data Theft, Privilege Escalation, and Persistence On-Prem Microsoft Exchange Server CVE-2026-42897 Exploited via Crafted Email Cisco Catalyst SD-WAN Controller Auth Bypass Actively Exploited to Gain Admin Access ThreatsDay Bulletin: PAN-OS RCE, Mythos cURL Bug, AI Tokenizer Attacks, and 10+ Stories Windows Zero-Days Expose BitLocker Bypasses And CTFMON Privilege Escalation New Fragnesia Linux Kernel LPE Grants Root Access via Page Cache Corruption 18-Year-Old NGINX Rewrite Module Flaw Enables Unauthenticated RCE Microsoft's MDASH AI System Finds 16 Windows Flaws Fixed in Patch Tuesday [Webinar] How Modern Attack Paths Cross Code, Pipelines, and Cloud Microsoft Patches 138 Vulnerabilities, Including DNS and Netlogon RCE Flaws New Exim BDAT Vulnerability Exposes GnuTLS Builds to Potential Code Execution Mini Shai-Hulud Worm Compromises TanStack, Mistral AI, Guardrails AI and More Packages cPanel CVE-2026-41940 Under Active Exploitation to Deploy Filemanager Backdoor ⚡ Weekly Recap: Linux Rootkit, macOS Crypto Stealer, WebSocket Skimmers and More Hackers Used AI to Develop First Known Zero-Day 2FA Bypass for Mass Exploitation ⭐ Featured Resources [Webinar] Learn How to Handle Critical SOC Alerts With AI Support Identify Internal Attack Surfaces More Efficiently With a Free Assessment [eBook] Get the 3-Number SOC Diagnostic to Reduce Queue Risk [Guide] Stop Email Fraud Before It Turns Into Ransomware Damage