CVE-2026-40966Network attack vector

Cross-tenant memory disclosure via conversationId filter injection

Published Apr 28, 2026 · Updated Apr 28, 2026

Improper access control in Spring AI 1.0.0 through 1.0.5 and 1.1.0 through 1.1.4 allows remote attackers to read other users' chat memory. VectorStoreChatMemoryAdvisor embeds an untrusted conversationId into vector-store retrieval filter logic without restricting it to a literal identifier. Exposure requires an application to use that advisor and accept user-supplied conversationId values; successful injection discloses stored chat history, including secrets and credentials.

CVSS severity5.9
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Spring AI 1.0.0 through 1.0.5 and 1.1.0 through 1.1.4 allows remote attackers to read other users' chat memory. VectorStoreChatMemoryAdvisor embeds an untrusted conversationId into vector-store retrieval filter logic without restricting it to a literal identifier. Exposure requires an application to use that advisor and accept user-supplied conversationId values; successful injection discloses stored chat history, including secrets and credentials.

The record

CVE
CVE-2026-40966
Published
Apr 28, 2026
Updated
Apr 28, 2026
Vendor
Spring
Product
Spring AI
Classifications
CWE-284, T1213
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=1.0.0 <1.0.6
  2. Affected versionversion=1.1.0 <1.1.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Spring · Spring AIversion=1.0.0 <1.0.6; version=1.1.0 <1.1.5

Published CVSS scores

5.9VMwareCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1213Data from Information Repositories

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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