CVE-2026-34828Public exploitNetwork attack vector

Account access persistence via unrevoked sessions

Published Apr 2, 2026 · Updated Apr 2, 2026

Insufficient session expiration in knadh listmonk 4.1.0 through 6.0.0 allows remote authenticated users to retain account access. Password-reset and profile-update paths change the password but do not delete previously issued database-backed sessions. Possession of an existing session cookie is required; replay preserves the compromised account access, including for accounts protected by TOTP.

CVSS severity7.1
High
EPSS probability0.30%
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 knadh listmonk 4.1.0 through 6.0.0 allows remote authenticated users to retain account access. Password-reset and profile-update paths change the password but do not delete previously issued database-backed sessions. Possession of an existing session cookie is required; replay preserves the compromised account access, including for accounts protected by TOTP.

The record

CVE
CVE-2026-34828
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
knadh
Product
listmonk
Classifications
CWE-613, T1550.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 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=>= 4.1.0, < 6.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

knadh · listmonkversion=>= 4.1.0, < 6.1.0

Published CVSS scores

7.1GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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