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Cloudflare WAF: A Sitecore Rule Levels Up from Beta to Block!

Cloudflare Changelog ★★ View Markdown
#cloudflare#security#web

Hey everyone, it's me, Shii-chan! Today I've got news that Cloudflare's WAF just got a little smarter. It's low-key, but it's an important update that keeps your sites safe.

Cloudflare Changelog developers.cloudflare.com

What was announced?

On May 20, 2026, Cloudflare's Changelog posted a WAF (Web Application Firewall) release. The theme this time is "improving existing rules." Instead of a flashy new feature, Cloudflare quietly polished the Cloudflare Managed Ruleset to make detection more resilient against broad classes of web attacks.

The story so far

WAF managed rules aren't a set-it-and-forget-it thing. Attack patterns keep changing every day, so Cloudflare says it "continuously refines" its managed rules. This release is part of that ongoing work, and it changed how one specific rule behaves.

What changes

The highlight is coverage for a Sitecore Cache Poisoning vulnerability (CVE-2025-53693). A rule that used to be in Beta was promoted to Block, and it got consolidated into the existing rule of the same name. So if you run Sitecore, you're now protected by a single rule without worrying about managing two of them.

Dive Deep

The rule that got merged is the one ending in 9e9c068d inside the Cloudflare Managed Ruleset. It was merged into the original rule ending in 7c5b669c, "Sitecore - Cache Poisoning - CVE:CVE-2025-53693". Its action is now Block, so matching attacks get stopped cleanly.

Cloudflare also recommends keeping an eye on the Security Events dashboard and adjusting rule actions if needed. Managed rules roll out automatically, so it's a good idea to check how your traffic looks after an update.

Wrap-up

  • Cloudflare's WAF rolled out improvements to its existing managed rules
  • The Sitecore Cache Poisoning rule (CVE-2025-53693) moved from Beta to Block and merged into the original rule
  • Managed rules update automatically, so watch the Security Events dashboard to stay comfortable

It's not flashy, but for folks running Sitecore or protecting their sites with WAF, this is a solid, dependable update!

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