CVE-2023-20903Network attack vector

Persistent access via unchecked identity-provider status

Published Mar 28, 2023 · Updated Feb 19, 2025

Insufficient session expiration in all versions of Cloud Foundry Foundation UAA allows remote authenticated users to retain resource access. The refresh-token grant path fails to check whether the external identity provider that issued the user session remains active and continues exchanging its refresh token for new access tokens. Exploitation requires a refresh token issued before an administrator deactivates that provider, preserving access to Cloud Foundry resources until the token expires, by default after 30 days.

CVSS severity4.3
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient session expiration in all versions of Cloud Foundry Foundation UAA allows remote authenticated users to retain resource access. The refresh-token grant path fails to check whether the external identity provider that issued the user session remains active and continues exchanging its refresh token for new access tokens. Exploitation requires a refresh token issued before an administrator deactivates that provider, preserving access to Cloud Foundry resources until the token expires, by default after 30 days.

The record

CVE
CVE-2023-20903
Published
Mar 28, 2023
Updated
Feb 19, 2025
Vendor
Cloud Foundry Foundation
Product
User Account and Authentication (UAA)
Classifications
CWE-613, T1550.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 19, 2025Record 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=All versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cloud Foundry Foundation · User Account and Authentication (UAA)version=All versions

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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.

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-613Insufficient Session Expiration
T1550.001Application Access Token

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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