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CVE-2026-34828

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

7.1 HighPublic exploitFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
Low
Availability
None

Exploit likelihood

0.31%Up 0.3 points since Apr 3, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.1

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

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.

Record
CVE-2026-34828
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-613
Updated
2026-11-02
EUVDEUVD-2026-18476 7.1

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.

Record
EUVD-2026-18476
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-h5j9-cvrw-v5qh 7.1

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

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:

  1. 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.

  2. 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

  1. Create or use a normal user account.
  2. Log in as that user and save the authenticated session cookie.
  3. Trigger forgot-password for the account.
  4. Use the emailed reset link and set a new password.
  5. Verify:
    • the old password no longer works
    • the new password works
  6. 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

  1. Log in twice as the same user and save two authenticated session cookies:

    • session A
    • session B

  2. Using session A, change the password through the authenticated profile update endpoint.

  3. Verify:

    • the old password no longer works
    • the new password works

  4. 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":"[email protected]",
  "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…

Record
GHSA-h5j9-cvrw-v5qh
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-613
Updated
2026-11-02
NVD 7.1

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.

Record
CVE-2026-34828
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-613
Updated
2026-11-02
OSV 7.1

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

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.

Record
CVE-2026-34828
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-613
Updated
2026-11-02
OSVGHSA-h5j9-cvrw-v5qh 7.1

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

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:

  1. 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.

  2. 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

  1. Create or use a normal user account.
  2. Log in as that user and save the authenticated session cookie.
  3. Trigger forgot-password for the account.
  4. Use the emailed reset link and set a new password.
  5. Verify:
    • the old password no longer works
    • the new password works
  6. 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

  1. Log in twice as the same user and save two authenticated session cookies:

    • session A
    • session B

  2. Using session A, change the password through the authenticated profile update endpoint.

  3. Verify:

    • the old password no longer works
    • the new password works

  4. 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":"[email protected]",
  "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…

Record
GHSA-h5j9-cvrw-v5qh
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-613
Updated
2026-11-02
OSVGO-2026-5414 No score

listmonk's active sessions remain valid after password reset and password change in github.com/knadh/listmonk

listmonk's active sessions remain valid after password reset and password change in github.com/knadh/listmonk

Record
GO-2026-5414
Updated
2026-11-02
OSVopenSUSE-SU-2026:21483-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

  • Update to version 0.0.20260723T184607 2026-07-23T18:46:07Z (jsc#PED-11136).

Go CVE Numbering Authority IDs added or updated with aliases:

  • GO-2026-4730 CVE-2026-33022 GHSA-cv4x-93xx-wgfj
  • GO-2026-4761 CVE-2026-33211 GHSA-j5q5-j9gm-2w5c
  • GO-2026-5102 CVE-2026-45021 GHSA-3vcp-chfh-f6r2
  • GO-2026-5272 CVE-2026-40938 GHSA-94jr-7pqp-xhcq
  • GO-2026-5486 CVE-2026-40924 GHSA-m2cx-gpqf-qf74
  • GO-2026-5542 CVE-2026-40090 GHSA-pj97-4p9w-gx3q
  • GO-2026-5630 CVE-2026-25542 GHSA-rmx9-2pp3-xhcr
  • GO-2026-5643 CVE-2026-40923 GHSA-rx35-6rhx-7858
  • GO-2026-5675 CVE-2026-41492 GHSA-vvf7-6rmr-m29q
  • GO-2026-5711 CVE-2026-40161 GHSA-wjxp-xrpv-xpff
  • GO-2026-5746 CVE-2026-41567 GHSA-x86f-5xw2-fm2r
  • GO-2026-5749 CVE-2026-41328 GHSA-x92x-px7w-4gx4
  • GO-2026-5837 CVE-2026-44840 GHSA-q2m9-6jp9-c6mc
  • GO-2026-5929 CVE-2026-44342 GHSA-26v7-h57m-gh9m
  • GO-2026-5930 CVE-2026-33655 GHSA-6qcr-qxgr-m7fv
  • GO-2026-5933 GHSA-3g4q-2f67-2gvh
  • GO-2026-5934 GHSA-59qp-cfj3-rp64
  • GO-2026-5935 GHSA-7856-g3gv-9wq8
  • GO-2026-5936 CVE-2026-53552 GHSA-26rh-24rg-j3vv
  • GO-2026-5937 CVE-2026-53508 GHSA-2jcc-mxv7-p3f9
  • GO-2026-5938 CVE-2026-53553 GHSA-4g5x-hcwm-82jw
  • GO-2026-5939 CVE-2026-10517 GHSA-698x-9w2p-7vvp
  • GO-2026-5940 CVE-2026-53572 GHSA-6w3m-4hhp-775q
  • GO-2026-5941 CVE-2026-53487 GHSA-gvhc-wv3v-7pf8
  • GO-2026-5942 CVE-2026-46600
  • GO-2026-5944 CVE-2026-50197 GHSA-659f-rgp5-w4wf
  • GO-2026-5945 CVE-2026-6815 GHSA-rmxx-v9rj-vpvg
  • GO-2026-5946 CVE-2026-52831 GHSA-v5px-423j-pf7p
  • GO-2026-5947 CVE-2026-53649 GHSA-xqhv-chqm-fhcc
  • GO-2026-5948 CVE-2026-50554 GHSA-588f-fvcv-xhvf
  • GO-2026-5949 CVE-2026-50553 GHSA-rqrh-8wpv-x7hh
  • GO-2026-5950 CVE-2026-53602 GHSA-339v-266x-79xr
  • GO-2026-5951 CVE-2026-10219 GHSA-6jm8-4fhr-5w64
  • GO-2026-5952 CVE-2026-49834 GHSA-9vcr-p3rj-q5q6
  • GO-2026-5953 CVE-2026-9094 GHSA-c9w5-qp6m-m395
  • GO-2026-5956 CVE-2026-55252 GHSA-h5g6-xmh4-hc37
  • GO-2026-5957 CVE-2026-54158 GHSA-5xfx-xj4h-5p7r
  • GO-2026-5958 CVE-2026-54068 GHSA-gcm7-57gf-953c
  • GO-2026-5959 CVE-2026-54072 GHSA-h29v-hj44-q8cv
  • GO-2026-5961 CVE-2026-54069 GHSA-hvr9-72v2-fff3
  • GO-2026-5962 CVE-2026-54088 GHSA-m93h-4hw7-5qcm
  • GO-2026-5963 CVE-2026-54067 GHSA-mvjr-vv3c-w4qv
  • GO-2026-5964 CVE-2026-54066 GHSA-p4m3-mgmm-c664
  • GO-2026-5965 CVE-2026-54070 GHSA-w7cg-whh7-xp28
  • GO-2026-5966 CVE-2026-54089 GHSA-xqp3-jq6g-x3qm
  • GO-2026-5967 CVE-2026-50551 GHSA-56mp-4f3v-fgj2
  • GO-2026-5968 CVE-2026-54174 GHSA-fpg8-7664-jc5q
  • GO-2026-5969 GHSA-g936-7jqj-mwv8
  • GO-2026-5970 CVE-2026-56852
  • GO-2026-5973 CVE-2026-54250 GHSA-jxr7-mqhw-9p98
  • GO-2026-5974 CVE-2026-44300 GHSA-wmj8-9953-vff5
  • GO-2026-5975 CVE-2026-50018 GHSA-42j2-w334-qxw7
  • GO-2026-5976 CVE-2026-50141 GHSA-g7mm-9vx7-jm7h
  • GO-2026-5977 CVE-2026-50013 GHSA-qrh4-p6v4-mrfg
  • GO-2026-5978 CVE-2026-50125 GHSA-qw5r-ppcg-f8rj
  • GO-2026-5979 CVE-2026-50006 GHSA-xrcf-6jh3-ggvx
  • GO-2026-5980 CVE-2026-50158 GHSA-2c7f-fxww-6w6c
  • GO-2026-5981 GHSA-mqxv-9rm6-w8qc
  • GO-2026-5982 GHSA-pqg7-v6wh-3pfp
  • GO-2026-5984 CVE-2026-53604 GHSA-2p2f-px33-4vv5
  • GO-2026-5985 GHSA-7rx3-5wx3-5v76
  • GO-2026-5986 CVE-2026-61699 GHSA-cm26-5974-52h8
  • GO-2026-5987 CVE-2026-55513 GHSA-g4x6-jcvr-9m3g
  • GO-2026-5988 CVE-2026-54628 GHSA-hwrq-8wxh-q4xv
  • GO-2026-5989 CVE-2026-55512 GHSA-m3cx-mwpg-32jg
  • GO-2026-5990 CVE-2026-54629 GHSA-mf78-3rpf-r784
  • GO-2026-5991 CVE-2026-53603 GHSA-q4vm-pq3q-8wgq
  • GO-2026-5992 CVE-2026-61549 GHSA-qf34-295c-26v8
  • GO-2026-5996 CVE-2026-54450 GHSA-pph6-vfjv-vpjw
  • GO-2026-5997 CVE-2026-54452 GHSA-xgch-x3mx-cm3c
  • GO-2026-5998 CVE-2026-54495 GHSA-398h-7f66-3h4p
  • GO-2026-5999 CVE-2026-10814 GHSA-jh6h-v6mp-h22v
  • GO-2026-6002 CVE-2026-58196 GHSA-pr64-jmmf-jp54
  • GO-2026-6003 CVE-2026-53714 GHSA-22xc-xg2r-9j7v
  • GO-2026-6004 CVE-2026-52833 GHSA-3v79-m2cg-89ww
  • GO-2026-6005 CVE-2026-53715 GHSA-8fv2-88gg-hm7q
  • GO-2026-6006 CVE-2026-53716 GHSA-cxpq-8v7q-cg56 *…
Record
openSUSE-SU-2026:21483-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
github.com/knadh/listmonk
Go
 1.1.1-0.20241028090858-319053dd7a90 up to 1.1.1-0.20260329113754-1b5e8d38c778
1.1.1-0.20260329113754-1b5e8d38c778
govulncheck-vulndb
openSUSE:Leap 16.0
From an advisory covering 1734 CVEs
 before 0.0.20260723T184607-160000.1.1
0.0.20260723T184607-160000.1.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHub0xmrma/CVE-2026-348282026-04-02

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-34828 is a high vulnerability (CVSS 7.1) in Knadh Listmonk, published April 1, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.31%, the 24th percentile. Fixed in github.com/knadh/listmonk 1.1.1-0.20260329113754-1b5e8d38c778.

References

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