CVE-2026-54518 Fasterxml — Exploit & Vulnerability Details MEDIUM

Parameter	Value
CVSS	6.5 (MEDIUM)
Affected Versions	2.21.0 — 3.1.4
Fixed In	2.21.4
Type	CWE-863 (Incorrect Authorization)
Vendor	Fasterxml
Public PoC	No

jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Processor. From 2.21.0 until 2.21.4 and 3.1.4, UnwrappedPropertyHandler.processUnwrappedCreatorProperties() replays buffered JSON into creator parameters but never consults prop.visibleInView(activeView). The normal property-based creator path gates creator properties on the active view, but this unwrapped-creator replay path bypasses that check, so a constructor parameter annotated with both @JsonView(AdminView.class) and @JsonUnwrapped is populated from attacker JSON even when a more restrictive view is active.

This vulnerability is fixed in 2.21.4 and 3.1.4.

Attack Parameters

Attack Vector

Network

Can be exploited remotely

Attack Complexity

Low

Easy to exploit

Privileges Required

None

No privileges needed

User Interaction

None

No user interaction needed

Impact Assessment

Confidentiality

Low

Partial data leak

Integrity

Low

Partial data modification

Availability

None

No disruption

CVSS Vector v3.1

Weakness Type (CWE)

CWE-863 Incorrect Authorization

Vulnerable Products 2

Configuration	From (including)	Up to (excluding)
Fasterxml Jackson-Databind cpe:2.3:a:fasterxml:jackson-databind::::::::	`2.21.0`	`2.21.4`
Fasterxml Jackson-Databind cpe:2.3:a:fasterxml:jackson-databind::::::::	`3.0.0`	`3.1.4`