Authenticated cross-template access via missing permission checks
Published Aug 26, 2026 · Updated Aug 26, 2026
Broken access control in Winter CMS before 1.2.13 allows remote authenticated users to access unauthorized theme resources and actions. Cms\Controllers\Index accepts template types in AJAX handlers without checking the corresponding CMS permission, while AssetList exposes uploads without its asset permission and theme validation. A backend account with any one Theme Editor permission can cross permission boundaries to read content or perform unauthorized operations on active-theme files.
Summary
What happened
Broken access control in Winter CMS before 1.2.13 allows remote authenticated users to access unauthorized theme resources and actions. Cms\Controllers\Index accepts template types in AJAX handlers without checking the corresponding CMS permission, while AssetList exposes uploads without its asset permission and theme validation. A backend account with any one Theme Editor permission can cross permission boundaries to read content or perform unauthorized operations on active-theme files.
The record
- CVE
- CVE-2026-32639
- Published
- Aug 26, 2026
- Updated
- Aug 26, 2026
- Vendor
- Winter CMS
- Product
- Winter CMS
- Classifications
- CWE-280
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 26, 2026CVE publishedPublication date reported by the CVE source.
- Aug 26, 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.
- Affected versionversion=< 1.2.13
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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