CVE-2020-5402Network attack vector

Authentication-flow manipulation via unchecked OAuth2 state

Published Feb 27, 2020 · Updated Sep 16, 2024

CSRF in Cloud Foundry Foundation UAA before 74.14.0 allows remote attackers to manipulate external-provider authentication. The external identity provider callback accepts an OAuth2 response without comparing its state parameter with the value bound to the initiating browser session. Exploitation requires user interaction and a configured external identity provider; the vendor does not further detail the resulting account or session impact.

CVSS severity8.8
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in Cloud Foundry Foundation UAA before 74.14.0 allows remote attackers to manipulate external-provider authentication. The external identity provider callback accepts an OAuth2 response without comparing its state parameter with the value bound to the initiating browser session. Exploitation requires user interaction and a configured external identity provider; the vendor does not further detail the resulting account or session impact.

The record

CVE
CVE-2020-5402
Published
Feb 27, 2020
Updated
Sep 16, 2024
Vendor
Cloud Foundry Foundation
Product
User Account and Authentication (UAA)
Classifications
CWE-352
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 27, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record 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=unspecified <v74.14.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cloud Foundry Foundation · User Account and Authentication (UAA)version=unspecified <v74.14.0

Published CVSS scores

8.8Pivotal Software, Inc.CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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-352Cross-Site Request Forgery (CSRF)

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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