CVE-2026-47856Network attack vector

Authenticated arbitrary class loading via untrusted type header

Published Aug 26, 2026 · Updated Aug 27, 2026

Deserialization of untrusted data in Spring Integration allows remote authenticated users to load arbitrary classes through crafted message headers. JsonToObjectTransformer passes the externally supplied json__TypeId__ value to ClassUtils.forName without a type or package allow-list, then binds JSON to the resolved class. Exploitation requires an external producer whose AMQP or Kafka header is mapped into the message, and loading remains limited to classes present on the application classpath.

CVSS severity6.3
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization of untrusted data in Spring Integration allows remote authenticated users to load arbitrary classes through crafted message headers. JsonToObjectTransformer passes the externally supplied json__TypeId__ value to ClassUtils.forName without a type or package allow-list, then binds JSON to the resolved class. Exploitation requires an external producer whose AMQP or Kafka header is mapped into the message, and loading remains limited to classes present on the application classpath.

The record

CVE
CVE-2026-47856
Published
Aug 26, 2026
Updated
Aug 27, 2026
Vendor
Spring
Product
Spring Integration
Classifications
CWE-502, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <=5.5.21
  2. Affected versionversion=6.4.0 <=6.4.12
  3. Affected versionversion=6.5.0 <=6.5.10
  4. Affected versionversion=7.0.0 <=7.0.5
  5. Affected versionversion=7.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Spring · Spring Integrationversion=0 <=5.5.21; version=6.4.0 <=6.4.12; version=6.5.0 <=6.5.10; version=7.0.0 <=7.0.5; version=7.1.0

Published CVSS scores

6.3SpringCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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