Vulnerability-Lookup

CVE-2026-34828 (GCVE-0-2026-34828)

Vulnerability from cvelistv5 – Published: 2026-04-02 17:32 – Updated: 2026-04-03 17:33

KEVintel KEV

Title

listmonk: Active sessions remain valid after password reset and password change

Summary

listmonk is a standalone, self-hosted, newsletter and mailing list manager. From version 4.1.0 to before version 6.1.0, a session management vulnerability allows previously issued authenticated sessions to remain valid after sensitive account security changes, specifically password reset and password change. As a result, an attacker who has already obtained a valid session cookie can retain access to the account even after the victim changes or resets their password. This weakens account recovery and session security guarantees. This issue has been patched in version 6.1.0.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-613 - Insufficient Session Expiration

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/knadh/listmonk/security/adviso…	x_refsource_CONFIRM
https://github.com/knadh/listmonk/commit/db82035d…	x_refsource_MISC
https://github.com/knadh/listmonk/releases/tag/v6.1.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
knadh	listmonk	Affected: >= 4.1.0, < 6.1.0

KEVintel KEV

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: 83c90d7c-9e3b-47f8-bdfb-c9c5d5f6553a

Vulnerability ID: CVE-2026-34828

Status: Confirmed

Status Updated: 2026-04-02 09:00 UTC

Exploited: Yes

Timestamps

First Seen: 2026-04-02

Asserted: 2026-04-02

Scope

Notes: KEVIntel entry: listmonk: Active sessions remain valid after password reset and password change | Affected: knadh / listmonk | CVSS: 7.1 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: True

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details

Feed	KEVIntel (kevintel.com)
Title	listmonk: Active sessions remain valid after password reset and password change
Vendor	knadh
Product	listmonk
Added Date	2026-04-02T09:00:05.000Z
Cvss Score	7.1
Epss Score	None
Cvss Severity	HIGH
Epss Percentile	None
Used In Malware	unknown
Ahead Of Cisa Kev	None
Not Yet In Cisa Kev	True

References

Created: 2026-06-19 12:45 UTC | Updated: 2026-06-19 12:45 UTC

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-34828

Vulnerability from fkie_nvd - Published: 2026-04-02 18:16 - Updated: 2026-06-17 10:39

KEVintel KEV

Severity

7.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/knadh/listmonk/commit/db82035d619348949512dafdaf60c86037cafc9e	Patch
security-advisories@github.com	https://github.com/knadh/listmonk/releases/tag/v6.1.0	Product, Release Notes
security-advisories@github.com	https://github.com/knadh/listmonk/security/advisories/GHSA-h5j9-cvrw-v5qh	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	nadh	listmonk	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "listmonk",
          "vendor": "knadh",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 4.1.0, \u003c 6.1.0"
            }
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      "source": "security-advisories@github.com"
    }
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    }
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  "lastModified": "2026-06-17T10:39:42.260",
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GHSA-H5J9-CVRW-V5QH

Vulnerability from github – Published: 2026-04-01 23:48 – Updated: 2026-04-06 17:25

Summary

listmonk's active sessions remain valid after password reset and password change

Details

Summary

A session management vulnerability allows previously issued authenticated sessions to remain valid after sensitive account security changes, specifically password reset and password change. As a result, an attacker who has already obtained a valid session cookie can retain access to the account even after the victim changes or resets their password.

This weakens account recovery and session security guarantees. I reproduced the issue on listmonk v6.0.0.

Details

The application updates account credentials successfully, but existing active sessions are not revoked afterward.

This behavior was confirmed in two flows:

Password reset flow
A user resets their password through the forgot/reset flow.
The old password becomes invalid.
The new password works.
However, a session cookie issued before the reset remains valid and continues to authenticate successfully.
Authenticated password change flow
The same user logs in from two separate sessions.
Using session A, the password is changed through the authenticated profile endpoint.
The old password becomes invalid.
The new password works.
However, session B, issued before the password change, remains valid and continues to authenticate successfully.

From the source review, the reset flow consumes the reset token, updates the password, and creates a fresh session, but there does not appear to be any revocation of older sessions. The same applies to the profile password change flow.

Relevant code areas observed during review: - cmd/auth.go — forgot/reset flow - cmd/users.go — authenticated profile update flow - internal/core/users.go — password update path

Additionally: - It was verified that reset links are single-use. - It was verified that password reset on a TOTP-enabled account still enforces TOTP on fresh login. - However, already-issued sessions still remain valid after reset.

PoC

Case 1: Password reset does not revoke existing session

Create or use a normal user account.
Log in as that user and save the authenticated session cookie.
Trigger forgot-password for the account.
Use the emailed reset link and set a new password.
Verify:
the old password no longer works
the new password works
Replay the old pre-reset session cookie against an authenticated endpoint such as /api/profile.

Example validation request:

GET /api/profile HTTP/1.1
Host: 127.0.0.1:9000
Cookie: session=<old_pre_reset_session>

Observed result:

Server returns HTTP/1.1 200 OK Response contains the authenticated user profile

Case 2: Password change does not revoke other active sessions

Log in twice as the same user and save two authenticated session cookies:
session A
session B
Using session A, change the password through the authenticated profile update endpoint.
Verify:
the old password no longer works
the new password works
Replay session B against an authenticated endpoint such as /api/profile.

Example password change request:

PUT /api/profile HTTP/1.1
Host: 127.0.0.1:9000
Cookie: session=<session_A>
Content-Type: application/json

{
  "name":"victim1",
  "email":"victim1@test.local",
  "password":"VictimChanged123"
}

Then validate session B:

GET /api/profile HTTP/1.1
Host: 127.0.0.1:9000
Cookie: session=<session_B>

Observed result: - Server returns HTTP/1.1 200 OK - Response contains the authenticated user profile

Impact

This issue allows persistence of unauthorized access after credential recovery actions.

If an attacker has already stolen a valid session cookie through any means (for example malware, browser compromise, XSS, shared machine access, proxy leakage, or other session theft), the victim cannot fully recover the account by changing or resetting the password alone. The attacker’s existing session remains valid.

This impacts account recovery expectations and session security for all authenticated users, including users with TOTP enabled.

Attachment

listmonk-session-report.zip

Severity

7.1 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/knadh/listmonk"
      },
      "ranges": [
        {
          "events": [
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              "introduced": "1.1.1-0.20241028090858-319053dd7a90"
            },
            {
              "fixed": "1.1.1-0.20260329113754-1b5e8d38c778"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-34828"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-613"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-01T23:48:43Z",
    "nvd_published_at": "2026-04-02T18:16:33Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nA session management vulnerability allows previously issued authenticated sessions to remain valid after sensitive account security changes, specifically password reset and password change. As a result, an attacker who has already obtained a valid session cookie can retain access to the account even after the victim changes or resets their password.\n\nThis weakens account recovery and session security guarantees. I reproduced the issue on listmonk v6.0.0.\n\n### Details\nThe application updates account credentials successfully, but existing active sessions are not revoked afterward.\n\nThis behavior was confirmed in two flows:\n\n1. **Password reset flow**\n   - A user resets their password through the forgot/reset flow.\n   - The old password becomes invalid.\n   - The new password works.\n   - However, a session cookie issued **before** the reset remains valid and continues to authenticate successfully.\n\n2. **Authenticated password change flow**\n   - The same user logs in from two separate sessions.\n   - Using session A, the password is changed through the authenticated profile endpoint.\n   - The old password becomes invalid.\n   - The new password works.\n   - However, session B, issued before the password change, remains valid and continues to authenticate successfully.\n\nFrom the source review, the reset flow consumes the reset token, updates the password, and creates a fresh session, but there does not appear to be any revocation of older sessions. The same applies to the profile password change flow.\n\nRelevant code areas observed during review:\n- `cmd/auth.go` \u2014 forgot/reset flow\n- `cmd/users.go` \u2014 authenticated profile update flow\n- `internal/core/users.go` \u2014 password update path\n\nAdditionally:\n- It was verified that reset links are single-use.\n- It was verified that password reset on a TOTP-enabled account still enforces TOTP on fresh login.\n- However, already-issued sessions still remain valid after reset.\n\n### PoC\n#### Case 1: Password reset does not revoke existing session\n\n1. Create or use a normal user account.\n2. Log in as that user and save the authenticated session cookie.\n3. Trigger forgot-password for the account.\n4. Use the emailed reset link and set a new password.\n5. Verify:\n   - the old password no longer works\n   - the new password works\n6. Replay the **old pre-reset session cookie** against an authenticated endpoint such as `/api/profile`.\n\nExample validation request:\n```http\nGET /api/profile HTTP/1.1\nHost: 127.0.0.1:9000\nCookie: session=\u003cold_pre_reset_session\u003e\n```\n\nObserved result:\n\nServer returns `HTTP/1.1 200 OK`\nResponse contains the authenticated user profile\n\n#### Case 2: Password change does not revoke other active sessions\n\n1. Log in twice as the same user and save two authenticated session cookies:\n   - session A\n   - session B\n\n2. Using session A, change the password through the authenticated profile update endpoint.\n\n3. Verify:\n   - the old password no longer works\n   - the new password works\n\n4. Replay session B against an authenticated endpoint such as `/api/profile`.\n\nExample password change request:\n```http\nPUT /api/profile HTTP/1.1\nHost: 127.0.0.1:9000\nCookie: session=\u003csession_A\u003e\nContent-Type: application/json\n\n{\n  \"name\":\"victim1\",\n  \"email\":\"victim1@test.local\",\n  \"password\":\"VictimChanged123\"\n}\n```\n\nThen validate session B:\n```http\nGET /api/profile HTTP/1.1\nHost: 127.0.0.1:9000\nCookie: session=\u003csession_B\u003e\n```\n\nObserved result:\n- Server returns `HTTP/1.1 200 OK`\n- Response contains the authenticated user profile\n\n## Impact\n\nThis issue allows persistence of unauthorized access after credential recovery actions.\n\nIf an attacker has already stolen a valid session cookie through any means (for example malware, browser compromise, XSS, shared machine access, proxy leakage, or other session theft), the victim cannot fully recover the account by changing or resetting the password alone. The attacker\u2019s existing session remains valid.\n\nThis impacts account recovery expectations and session security for all authenticated users, including users with TOTP enabled.\n\n## Attachment\n[listmonk-session-report.zip](https://github.com/user-attachments/files/25975979/listmonk-session-report.zip)",
  "id": "GHSA-h5j9-cvrw-v5qh",
  "modified": "2026-04-06T17:25:20Z",
  "published": "2026-04-01T23:48:43Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/knadh/listmonk/security/advisories/GHSA-h5j9-cvrw-v5qh"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34828"
    },
    {
      "type": "WEB",
      "url": "https://github.com/knadh/listmonk/commit/db82035d619348949512dafdaf60c86037cafc9e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/knadh/listmonk"
    },
    {
      "type": "WEB",
      "url": "https://github.com/knadh/listmonk/releases/tag/v6.1.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "listmonk\u0027s active sessions remain valid after password reset and password change"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-34828 (GCVE-0-2026-34828)

KEVintel KEV

Known Exploited Vulnerability - GCVE BCP-07 Compliant

Timestamps

Scope

Evidence

Public Report Successful Exploitation Confidence: 70% Source: kevintel

Details

References

FKIE_CVE-2026-34828

GHSA-H5J9-CVRW-V5QH

Summary

Details

PoC

Case 1: Password reset does not revoke existing session

Case 2: Password change does not revoke other active sessions

Impact

Attachment

Tags

Sightings

Nomenclature