p PatchFirst

CVE-2026-34046

CVE-2026-34046 · Langflow: Authenticated Users Can Read, Modify, and Delete Any Flow via Missing Ownership Check

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.5.1, the `_read_flow` helper in `src/backend/base/langflow/api/v1/flows.py` branched on the `AUTO_LOGIN` setting to decide whether to filter by `user_id`. When `AUTO_LOGIN` was `False` (i.e., authentication was enabled), neither branch enforced an ownership check — the query returned any flow matching the given UUID regardless of who owned it. This allowed any authenticated user to read any other user's flow, including embedded plaintext API keys; modify the logic of another user's AI agents, and/or delete flows belonging to other users. The vulnerability was introduced by the conditional logic that was meant to accommodate public/example flows (those with `user_id = NULL`) under auto-login mode, but inadvertently left the authenticated path without an ownership filter. The fix in version 1.5.1 removes the `AUTO_LOGIN` conditional entirely and unconditionally scopes the query to the requesting user.

CVSS 8.7 · High · EPSS 0.7% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • langflow

    Versions
    • < 1.5.1: Affected

    No fix published

  • langflow-base

    Versions
    • < 0.5.1: Affected

    No fix published

  • langflow PyPI

    Versions
    • 0.0.31
    • 0.0.32
    • 0.0.33
    • 0.0.40
    • 0.0.44
    • 0.0.45
    • 0.0.46
    • 0.0.52
    • 0.0.53
    • 0.0.54
    • 0.0.55
    • 0.0.56
    • 0.0.57
    • 0.0.58
    • 0.0.61
    • 0.0.62
    • 0.0.63
    • 0.0.64
    • 0.0.65
    • 0.0.66
    • 0.0.67
    • 0.0.68
    • 0.0.69
    • 0.0.70
    • 0.0.71
    • 0.0.72
    • 0.0.73
    • 0.0.74
    • 0.0.75
    • 0.0.76
    • 0.0.78
    • 0.0.79
    • 0.0.80
    • 0.0.81
    • 0.0.83
    • 0.0.84
    • 0.0.85
    • 0.0.86
    • 0.0.87
    • 0.0.88
    • 0.0.89
    • 0.1.0
    • 0.1.2
    • 0.1.3
    • 0.1.4
    • 0.1.5
    • 0.1.6
    • 0.1.7
    • 0.2.0
    • 0.2.1
    • 0.2.10
    • 0.2.11
    • 0.2.12
    • 0.2.13
    • 0.2.2
    • 0.2.3
    • 0.2.4
    • 0.2.5
    • 0.2.6
    • 0.2.7
    • 0.2.8
    • 0.2.9
    • 0.3.0
    • 0.3.1
    • 0.3.2
    • 0.3.3
    • 0.3.4
    • 0.4.0
    • 0.4.1
    • 0.4.10
    • 0.4.11
    • 0.4.12
    • 0.4.14
    • 0.4.15
    • 0.4.16
    • 0.4.17
    • 0.4.18
    • 0.4.19
    • 0.4.2
    • 0.4.20
    • 0.4.21
    • 0.4.3
    • 0.4.4
    • 0.4.5
    • 0.4.6
    • 0.4.7
    • 0.4.8
    • 0.4.9
    • 0.5.0
    • 0.5.0a0
    • 0.5.0a1
    • 0.5.0a2
    • 0.5.0a3
    • 0.5.0a4
    • 0.5.0a5
    • 0.5.0a6
    • 0.5.0b0
    • 0.5.0b2
    • 0.5.0b3
    • 0.5.0b4
    • 0.5.0b5
    • 0.5.0b6
    • 0.5.1
    • 0.5.10
    • 0.5.11
    • 0.5.12
    • 0.5.2
    • 0.5.3
    • 0.5.4
    • 0.5.5
    • 0.5.6
    • 0.5.7
    • 0.5.8
    • 0.5.9
    • 0.6.0
    • 0.6.0rc1
    • 0.6.1
    • 0.6.10
    • 0.6.11
    • 0.6.12
    • 0.6.14
    • 0.6.15
    • 0.6.16
    • 0.6.17
    • 0.6.18
    • 0.6.19
    • 0.6.2
    • 0.6.3
    • 0.6.3a0
    • 0.6.3a1
    • 0.6.3a2
    • 0.6.3a3
    • 0.6.3a4
    • 0.6.3a5
    • 0.6.3a6
    • 0.6.3a7
    • 0.6.4
    • 0.6.4a0
    • 0.6.4a1
    • 0.6.5
    • 0.6.5a0
    • 0.6.5a1
    • 0.6.5a10
    • 0.6.5a11
    • 0.6.5a12
    • 0.6.5a13
    • 0.6.5a2
    • 0.6.5a3
    • 0.6.5a4
    • 0.6.5a5
    • 0.6.5a6
    • 0.6.5a7
    • 0.6.5a8
    • 0.6.5a9
    • 0.6.6
    • 0.6.7
    • 0.6.7a1
    • 0.6.7a2
    • 0.6.7a3
    • 0.6.7a5
    • 0.6.8
    • 0.6.9
    • 1.0.0
    • 1.0.0a0
    • 1.0.0a1
    • 1.0.0a10
    • 1.0.0a11
    • 1.0.0a12
    • 1.0.0a13
    • 1.0.0a14
    • 1.0.0a15
    • 1.0.0a17
    • 1.0.0a18
    • 1.0.0a19
    • 1.0.0a2
    • 1.0.0a20
    • 1.0.0a21
    • 1.0.0a22
    • 1.0.0a23
    • 1.0.0a24
    • 1.0.0a25
    • 1.0.0a26
    • 1.0.0a27
    • 1.0.0a28
    • 1.0.0a29
    • 1.0.0a3
    • 1.0.0a30
    • 1.0.0a31
    • 1.0.0a32
    • 1.0.0a33
    • 1.0.0a34
    • 1.0.0a35
    • 1.0.0a36
    • 1.0.0a37
    • 1.0.0a38
    • 1.0.0a39
    • 1.0.0a4
    • 1.0.0a40
    • 1.0.0a41
    • 1.0.0a42
    • 1.0.0a43
    • 1.0.0a44
    • 1.0.0a45
    • 1.0.0a46
    • 1.0.0a47
    • 1.0.0a48
    • 1.0.0a49
    • 1.0.0a5
    • 1.0.0a50
    • 1.0.0a51
    • 1.0.0a52
    • 1.0.0a53
    • 1.0.0a55
    • 1.0.0a56
    • 1.0.0a57
    • 1.0.0a58
    • 1.0.0a59
    • 1.0.0a6
    • 1.0.0a60
    • 1.0.0a61
    • 1.0.0a7
    • 1.0.0a8
    • 1.0.0a9
    • 1.0.0rc0
    • 1.0.0rc1
    • 1.0.1
    • 1.0.10
    • 1.0.11
    • 1.0.12
    • 1.0.13
    • 1.0.14
    • 1.0.15
    • 1.0.16
    • 1.0.17
    • 1.0.18
    • 1.0.19
    • 1.0.19.post1
    • 1.0.19.post2
    • 1.0.2
    • 1.0.3
    • 1.0.4
    • 1.0.5
    • 1.0.6
    • 1.0.7
    • 1.0.8
    • 1.0.9
    • 1.1.0
    • 1.1.1
    • 1.1.2
    • 1.1.3
    • 1.1.4
    • 1.1.4.post1
    • 1.2.0
    • 1.3.0
    • 1.3.1
    • 1.3.2
    • 1.3.3
    • 1.3.4
    • 1.4.0
    • 1.4.1
    • 1.4.2
    • 1.4.3
    • 1.5.0
    • 1.5.0.post1
    • 1.5.0.post2
    Affected ranges
    • ECOSYSTEM: < 1.5.1

    Update to 1.5.1

  • langflow-base PyPI

    Versions
    • 0.0.13
    • 0.0.14
    • 0.0.15
    • 0.0.16
    • 0.0.17
    • 0.0.18
    • 0.0.19
    • 0.0.20
    • 0.0.21
    • 0.0.22
    • 0.0.23
    • 0.0.24
    • 0.0.25
    • 0.0.26
    • 0.0.27
    • 0.0.28
    • 0.0.29
    • 0.0.30
    • 0.0.31
    • 0.0.32
    • 0.0.33
    • 0.0.34
    • 0.0.35
    • 0.0.36
    • 0.0.37
    • 0.0.38
    • 0.0.39
    • 0.0.40
    • 0.0.41
    • 0.0.42
    • 0.0.43
    • 0.0.44
    • 0.0.45
    • 0.0.46
    • 0.0.47
    • 0.0.48
    • 0.0.49
    • 0.0.50
    • 0.0.51
    • 0.0.52
    • 0.0.53
    • 0.0.54
    • 0.0.55
    • 0.0.56
    • 0.0.57
    • 0.0.58
    • 0.0.59
    • 0.0.60
    • 0.0.61
    • 0.0.62
    • 0.0.63
    • 0.0.64
    • 0.0.66
    • 0.0.67
    • 0.0.68
    • 0.0.69
    • 0.0.70
    • 0.0.71
    • 0.0.72
    • 0.0.73
    • 0.0.74
    • 0.0.75
    • 0.0.76
    • 0.0.77
    • 0.0.78
    • 0.0.79
    • 0.0.80
    • 0.0.81
    • 0.0.82
    • 0.0.83
    • 0.0.84
    • 0.0.85
    • 0.0.86
    • 0.0.87
    • 0.0.88
    • 0.0.89
    • 0.0.90
    • 0.0.91
    • 0.0.92
    • 0.0.93
    • 0.0.94
    • 0.0.95
    • 0.0.96
    • 0.0.97
    • 0.0.98
    • 0.0.99
    • 0.1.0
    • 0.1.1
    • 0.1.2
    • 0.1.3
    • 0.1.4
    • 0.1.4.post1
    • 0.2.0
    • 0.3.0
    • 0.3.1
    • 0.3.2
    • 0.3.3
    • 0.3.4
    • 0.4.0
    • 0.4.1
    • 0.4.2
    • 0.4.3
    • 0.5.0
    • 0.5.0.post1
    • 0.5.0.post2
    Affected ranges
    • ECOSYSTEM: < 0.5.1

    Update to 0.5.1

Original sources

Check your server →