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CVE-2026-27591

Wintercms Winter broken access control

9.9 CRITICALEPSS 0.77%
  1. Published11 Mar 2026

Description

Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework. Prior to 1.0.477, 1.1.12, and 1.2.12, Winter CMS allowed authenticated backend users to escalate their accounts level of access to the system by modifying the roles / permissions assigned to their account through specially crafted requests to the backend while logged in. To actively exploit this security issue, an attacker would need access to the Backend with a user account with any level of access. This vulnerability is fixed in 1.0.477, 1.1.12, and 1.2.12.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

Wintercms Winter≥ 1.1.0 < 1.1.12 · ≥ 1.2.0 < 1.2.12 · < 1.0.477

Remediation

Fixed in
Wintercms Winter≥ 1.1.12

References

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Frequently asked

Is CVE-2026-27591 being actively exploited?

CVE-2026-27591 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.77%.

How severe is CVE-2026-27591?

CVE-2026-27591 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 0.77% probability of exploitation.

Which products are affected by CVE-2026-27591?

Affected products include Wintercms Winter.

How do I fix CVE-2026-27591?

Upgrade affected software to a fixed version, for example Wintercms Winter 1.1.12 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-27591 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.