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CVE

CVE-2026-27591

Winter: Privilege escalation by authenticated backend users
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CVE

CVE-2026-27591

Winter: Privilege escalation by authenticated backend users

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.9
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://wintercms.com/releases/v1.0.477, https://wintercms.com/releases/v1.1.12, https://wintercms.com/releases/v1.2.12, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27591.json, https://github.com/wintercms/winter/security/advisories/GHSA-pgpf-m8m4-6cg6, https://nvd.nist.gov/vuln/detail/CVE-2026-27591

Severity

9.9

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
9.9
EPSS Probability
0.00105%
EPSS Percentile
0.28103%
Introduced Version
6c690a90e1d8cab11397e7fd6b8c263708aa9096,6389554935644bfbb15db5fcd0ce4db6cbe3d103,0
Fix Available
b6ac66c5e80ddc9ecd9211c10204cdcee6e14313,76b57bccbb14b957b7981e43e0a5a969db220607,7d6258703f1da2fdadb10e3a2d0c7d09ac2ae782

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