CVE-2026-54859

Unauthenticated PHP Object Injection in Preservation <= 1.15 versions.

Base score9.8/ 10

SeverityCriticalCVSS 3.1

Exploitability / impact

CVSS metric breakdown

Vector-derived attributes

Base severityCritical

Attack vectorNetworkAV

Attack complexityLowAC

Privileges requiredNonePR

User interactionNoneUI

ScopeUnchangedS

Confidentiality impactHighC

Integrity impactHighI

Availability impactHighA

CVSS vector stringCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS communicates standardized severity and impact characteristics. It does not establish whether a system is exploitable in your specific environment.

Record context

CVE Numbering AuthorityPatchstack

Last updatedOct 29, 2026 19:40:30 UTC

PublishedOct 29, 2026 15:24:03 UTC

ReservedJun 16, 2026 09:22:06 UTC

Credits

johska | Patchstack Bug Bounty Program