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CVE-2026-84795 – Authentication Bypass / Privilege Escalation – Craft CMS 5.0.0-RC1 through 5.10.10

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Summary

CVE-2026-84795 is an improper privilege management vulnerability in Craft CMS that allows an unauthenticated attacker to obtain full administrator access to the control panel. The flaw stems from a missing validation guard on the admin privilege flag during user account registration/reactivation. It affects Craft CMS 5.x installations with public registration enabled and carries a CVSS score of 9.2.

Technical details

  • Root cause: User::afterSave() writes the admin flag unconditionally, with no change-detection guard — unlike other sensitive account flags (active, pending, locked, suspended), which are protected against unauthorized modification.
  • Trigger conditions: public registration must be enabled; on Craft Pro, email verification must also be disabled. An attacker registers a new account using the email address of a previously deactivated administrator account.
  • Mechanism: the system reuses the existing (inactive) user record tied to that email, which still carries its original admin status, and the missing validation lets that admin privilege transfer to the newly (re)activated account.
  • Attack vector: network, unauthenticated, no user interaction required.
  • Impact: full administrator access to the control panel, including user management, system settings, plugins, and site content.

Affected software

  • Craft CMS 5.0.0-RC1 through versions prior to 5.10.11
  • Exploitable configurations: Craft Team edition with allowPublicRegistration=true; Craft Pro edition with allowPublicRegistration=true and requireEmailVerification=false

Severity

CVSS v3.1: 9.8 (Critical) — AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0: 9.2 (Critical) — AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: upgrade Craft CMS to version 5.10.11 or later, where the admin flag change is properly guarded.
  • If immediate patching isn’t possible: disable public registration (allowPublicRegistration=false), or ensure email verification is required (requireEmailVerification=true) as an interim compensating control.
  • Audit user accounts for unexpected administrator privileges, particularly any recently created or reactivated accounts tied to previously deactivated admin email addresses.

How IONIX identifies potentially affected assets

IONIX matches the following signal against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Named HTTP response header (x-powered-by): Craft CMS

References

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Map your entire attack surface (continously)

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Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

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IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

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By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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