CVE-2026-54164Public exploitNetwork attack vector

Relation data corruption via unchecked IRI type

Published Jul 1, 2026 · Updated Jul 1, 2026

Type confusion in affected API Platform Core releases allows remote authenticated users to corrupt writable relation data through crafted IRIs. AbstractItemNormalizer resolves a relation IRI without passing an operation, bypassing IriConverter's class guard and assigning an object of the wrong declared type. The endpoint must accept writes to an untyped writable relation; PHP-typed properties reject the substitution, while legacy annotation-only properties can silently violate application invariants.

CVSS severity6.5
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Type confusion in affected API Platform Core releases allows remote authenticated users to corrupt writable relation data through crafted IRIs. AbstractItemNormalizer resolves a relation IRI without passing an operation, bypassing IriConverter's class guard and assigning an object of the wrong declared type. The endpoint must accept writes to an untyped writable relation; PHP-typed properties reject the substitution, while legacy annotation-only properties can silently violate application invariants.

The record

CVE
CVE-2026-54164
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
API Platform
Product
API Platform Core
Classifications
CWE-843, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.1.30
  2. Affected versionversion=>= 4.2.0, < 4.2.26
  3. Affected versionversion=>= 4.3.0, < 4.3.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

API Platform · API Platform Coreversion=< 4.1.30; version=>= 4.2.0, < 4.2.26; version=>= 4.3.0, < 4.3.12

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo