CVE-2026-31266Public exploitNetwork attack vector

Unauthenticated database changes via anonymous migrate action

Published May 27, 2026 · Updated May 27, 2026

Missing authorization in Craft CMS 5.9.5 and earlier allows remote attackers to invoke the migrate endpoint without authentication. AppController marks the migrate action as anonymously accessible in both live and offline modes, so a POST request reaches migration logic without an authorization check. The published proof of concept shows the unauthenticated action deleting the sessions table, disrupting session-backed operation.

CVSS severity7.3
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Craft CMS 5.9.5 and earlier allows remote attackers to invoke the migrate endpoint without authentication. AppController marks the migrate action as anonymously accessible in both live and offline modes, so a POST request reaches migration logic without an authorization check. The published proof of concept shows the unauthenticated action deleting the sessions table, disrupting session-backed operation.

The record

CVE
CVE-2026-31266
Published
May 27, 2026
Updated
May 27, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-862, T1485
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1485Data Destruction

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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