CVE-2026-33159Public exploitNetwork attack vector

Unauthenticated configuration changes via inherited anonymous access

Published Mar 24, 2026 · Updated Mar 24, 2026

Missing authentication in Craft CMS 4.0.0-RC1 through 4.17.7 and 5.0.0-RC1 through 5.9.13 lets remote attackers alter project configuration. ConfigSyncController inherits anonymous access from BaseUpdaterController, so its index action returns signed updater state that guest requests can replay against regenerate-yaml or apply-yaml-changes. No account is required, but consequences depend on pending YAML or configuration state and are limited to unauthorized configuration transitions and service-integrity changes.

CVSS severity6.9
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Craft CMS 4.0.0-RC1 through 4.17.7 and 5.0.0-RC1 through 5.9.13 lets remote attackers alter project configuration. ConfigSyncController inherits anonymous access from BaseUpdaterController, so its index action returns signed updater state that guest requests can replay against regenerate-yaml or apply-yaml-changes. No account is required, but consequences depend on pending YAML or configuration state and are limited to unauthorized configuration transitions and service-integrity changes.

The record

CVE
CVE-2026-33159
Published
Mar 24, 2026
Updated
Mar 24, 2026
Vendor
Pixel & Tonic
Product
Craft CMS
Classifications
CWE-306, CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 4.0.0-RC1, < 4.17.8
  2. Affected versionversion=>= 5.0.0-RC1, < 5.9.14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Pixel & Tonic · Craft CMSversion=>= 4.0.0-RC1, < 4.17.8; version=>= 5.0.0-RC1, < 5.9.14

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
6.9GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-862Missing Authorization
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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