Flatastic permits unauthenticated PHP object injection
Flatastic <= 2.0 allows an unauthenticated attacker to place attacker-controlled serialized data into an unsafe PHP deserialization path. Practical code execution depends on a usable gadget chain, but the CNA assigns high confidentiality, integrity and availability impact.
- Component
- Flatastic
- Plugin slug
flatastic- Affected
- n/a through 2.0
- Safe version
- See mitigation notes
- Published
- Aug 20, 2026
This CVE was published Aug 20, 2026 and is one of 2 known issues for this theme.
Update, patch or deactivate.
No fixed release is identified for CVE-2026-66672. Update Flatastic when a release newer than 2.0 is confirmed to fix this issue; until then, deactivate or remove the affected component when the site's risk warrants it. Review activity by the stated attacker class and investigate unexpected data access, state changes, files or sessions relevant to this vulnerability class.
No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
Unauthenticated PHP Object Injection in Flatastic <= 2.0 versions.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H