CVE-2026-55423Public exploit

Session reuse via mismatched logout cookie deletion

Published Jun 23, 2026 · Updated Jun 23, 2026

Insufficient session expiration in Langflow OSS before 1.7.0 allows physically proximate attackers to reuse a logged-out user's session. The /logout endpoint deletes authentication cookies without matching their original httponly, samesite, secure, and domain attributes, while the frontend leaves access and refresh tokens in browser storage. Exploitation requires a shared computer, disabled auto-login, and access to the prior user's browser profile; the retained session permits access and actions as that user.

CVSS severity6.1
Medium
EPSS probability0.22%
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 Langflow OSS before 1.7.0 allows physically proximate attackers to reuse a logged-out user's session. The /logout endpoint deletes authentication cookies without matching their original httponly, samesite, secure, and domain attributes, while the frontend leaves access and refresh tokens in browser storage. Exploitation requires a shared computer, disabled auto-login, and access to the prior user's browser profile; the retained session permits access and actions as that user.

The record

CVE
CVE-2026-55423
Published
Jun 23, 2026
Updated
Jun 23, 2026
Vendor
OpenBMC Project
Product
Langflow OSS
Classifications
CWE-613, T1550.004
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 23, 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=< 1.7.0

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

OpenBMC Project · Langflow OSSversion=< 1.7.0

Published CVSS scores

6.1GitHub, Inc.CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/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.

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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)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-613Insufficient Session Expiration
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

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Technologies

Your stack

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Your stack

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