CVE-2023-40178Public exploitNetwork attack vector

Session interruption via expired LogoutRequest replay

Published Aug 23, 2023 · Updated Oct 2, 2024

Improper LogoutRequest validation in Node SAML before 4.0.5 allows remote attackers to interrupt user sessions via expired requests. validatePostRequestAsync accepts a signed LogoutRequest without calling verifyLogoutRequest, so NotOnOrAfter expiration is not checked against the current time. Exploitation requires a previously valid signed request and forces the named user to be logged out; repeated or mass replay can interrupt many sessions.

CVSS severity5.3
Medium
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

Improper LogoutRequest validation in Node SAML before 4.0.5 allows remote attackers to interrupt user sessions via expired requests. validatePostRequestAsync accepts a signed LogoutRequest without calling verifyLogoutRequest, so NotOnOrAfter expiration is not checked against the current time. Exploitation requires a previously valid signed request and forces the named user to be logged out; repeated or mass replay can interrupt many sessions.

The record

CVE
CVE-2023-40178
Published
Aug 23, 2023
Updated
Oct 2, 2024
Vendor
node-saml
Product
Node SAML
Classifications
CWE-347, CWE-613
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 23, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 2, 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=0 <4.0.5
  2. Affected versionversion=< 4.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

node-saml · Node SAMLversion=0 <4.0.5; version=< 4.0.5

Published CVSS scores

5.3NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
CWE-613Insufficient Session Expiration

Public exploit references

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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