CVE-2026-107366CWE-639

CVE-2026-107366

High · published October 20, 2026

CVSS v3.1
8.3
EPSS
0%
Percentile
11.8
In the wild
Unconfirmed
What it is

IBM Langflow OSS 1.0.0 through 1.12.4 contains three message endpoints that perform no ownership verification. Any authenticated user can bulk-delete another user's messages, overwrite message content to inject malicious prompts, or hijack an entire conversation session by reassigning its session ID.

The record
Technical detail
CVSS v3.1
8.3 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
CVSS v4.0
Not supplied
EPSS
0.00219 · 11.8th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-10-20T04:17Z
References (1)
https://www.ibm.com/support/pages/node/7293016 · [email protected]
EPSS history
Timeline
  • 21 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 19 OCT 23:49Z
    Langflow OSS Authorization Bypass Through User-Controlled Key
    cvelistv5
  • 19 OCT 23:49Z
    Langflow OSS Authorization Bypass Through User-Controlled Key
    cvelistv5