CVE-2026-54256
unknown
CVSS v3
—
CVSS v4 NEW
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VIR risk
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Description
Winter: Authenticated IDOR in backend FileUpload widget allows cross-user access to attachment metadata
Predictions
Exploit likelihood
30%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
Propose a mitigation on Community Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Packagist | winter/wn-backend-module | <=1.2.12 | |
| Packagist | winter/wn-backend-module | <1.2.13 | 1.2.13 |
References
- https://github.com/advisories/GHSA-3277-h8g9-qj5f
- https://github.com/wintercms/winter/security/advisories/GHSA-3277-h8g9-qj5f
- https://github.com/wintercms/winter/security/advisories/GHSA-qq9m-vfv4-pj5w
- https://github.com/wintercms/winter/commit/9cb0ae5f9d837db141ab111c6a7de8eed9603d25
- https://github.com/wintercms/winter
- https://github.com/wintercms/winter/releases/tag/v1.2.13
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.