Langflow: IBM Langflow OSS 1.0.0 through 1.10.0 could allow a remote attacker to overwrite administrator…
Langflow
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- Severity
- High, CVSS 7.5
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Record
- CVE-2026-19875
- Affects
- Langflow
- Known exploited
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Published
- Record first published by the source
- August 19, 2026
- Source last modified
- August 26, 2026
Description
IBM Langflow OSS 1.0.0 through 1.10.0 could allow a remote attacker to overwrite administrator email information and abuse the server as an outbound relay due to missing authentication for the registration endpoint.
Description quoted from the NVD record.
Who is affected
Langflow (also called IBM Langflow OSS) is a tool for building apps that use AI language models. This flaw affects versions 1.0.0 through 1.10.0. The part of the product that handles new account registration does not check who is making the request. Because of this, an attacker who can reach your server over a network, without logging in, could overwrite the administrator's email information and misuse your Langflow server as a relay to send traffic out to other places. This flaw is rated High.
What to do
- Find out who installed or runs Langflow for your organization: a staff member, a volunteer, or an IT provider or vendor. That person should act on this flaw.
- If someone in your organization runs it, have them check whether your copy is a version from 1.0.0 through 1.10.0.
- No fixed version is named for this flaw yet, so check the vendor advisory linked on this page for a fixed release and install it as soon as one is available.
- If an IT provider or vendor runs Langflow for you, send them this advisory and ask when the update will be done.
Analysis written from the source record as of August 26, 2026 and reviewed before publishing.