CVE-2023-6837Network attack vector

User impersonation via unchecked JIT username reuse

Published Dec 15, 2023 · Updated Sep 25, 2025

Incorrect authorization in multiple WSO2 products allows remote authenticated users to impersonate local users through JIT provisioning. The JIT post-authentication handler accepts a supplied username and provisions it without first rejecting an existing local user, allowing the federated identity to be associated with that account. Exploitation requires a fresh federated account, knowledge of a local username, prompt-based JIT provisioning, and mapped-local-subject assertion.

CVSS severity8.5
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in multiple WSO2 products allows remote authenticated users to impersonate local users through JIT provisioning. The JIT post-authentication handler accepts a supplied username and provisions it without first rejecting an existing local user, allowing the federated identity to be associated with that account. Exploitation requires a fresh federated account, knowledge of a local username, prompt-based JIT provisioning, and mapped-local-subject assertion.

The record

CVE
CVE-2023-6837
Published
Dec 15, 2023
Updated
Sep 25, 2025
Vendor
WSO2
Product
WSO2 Identity Server
Classifications
CWE-863, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2025Record 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=5.10.0 <5.10.0.78
  2. Affected versionversion=5.11.0 <5.11.0.69
  3. Affected versionversion=5.6.0 <5.6.0.16
  4. Affected versionversion=5.7.0 <5.7.0.35
  5. Affected versionversion=5.8.0 <5.8.0.26
  6. Affected versionversion=5.9.0 <5.9.0.38

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WSO2 · WSO2 Identity Serverversion=5.10.0 <5.10.0.78; version=5.11.0 <5.11.0.69; version=5.6.0 <5.6.0.16; version=5.7.0 <5.7.0.35; version=5.8.0 <5.8.0.26; version=5.9.0 <5.9.0.38
WSO2 · WSO2 Identity Server as Key Managerversion=5.10.0 <5.10.0.80; version=5.6.0 <5.6.0.17; version=5.7.0 <5.7.0.39; version=5.9.0 <5.9.0.45
WSO2 · WSO2 Carbon Identity Application Authentication Frameworkversion=5.11.256 <5.11.256.3; version=5.12.153 <5.12.153.21; version=5.12.387 <5.12.387.7; version=5.14.97 <5.14.97.22; version=5.17.5 <5.17.5.106; version=5.18.187 <5.18.187.76
WSO2 · WSO2 API Managerversion=2.5.0 <2.5.0.32; version=2.6.0 <2.6.0.52; version=3.0.0 <3.0.0.50; version=3.1.0 <3.1.0.72; version=3.2.0 <3.2.0.86; version=4.0.0 <4.0.0.35

Published CVSS scores

8.5WSO2 LLCCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
8.2NIST NVDCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

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Your stack

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