CVE-2026-19875: CWE-306 Missing Authentication for Critical Function in IBM Langflow OSS
Description
IBM Langflow OSS versions 1.0.0 through 1.10.0 contain a vulnerability due to missing authentication on the registration endpoint. This flaw allows a remote attacker to overwrite administrator email information and misuse the server as an outbound relay. The vulnerability has a high severity rating with a CVSS score of 7.5.
CVSS v3.1
Score 7.5high
Affected software
IBM
Langflow OSS
cpe:2.3:a:ibm:langflow:1.0.0:*:*:*:*:*:*:*cpe:2.3:a:ibm:langflow:1.10.0:*:*:*:*:*:*:*Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-19875 is a vulnerability in IBM Langflow OSS versions 1.0.0 through 1.10.0 caused by missing authentication on a critical function, specifically the registration endpoint. This allows unauthenticated remote attackers to overwrite administrator email settings and abuse the server for outbound relay purposes. The vulnerability is classified under CWE-306 (Missing Authentication for Critical Function).
Potential Impact
The vulnerability enables remote attackers to modify administrator email information without authentication, potentially leading to abuse of the server as an outbound relay. This could facilitate unauthorized email relay activities, impacting the integrity of administrative controls and potentially enabling further malicious actions.
Mitigation Recommendations
No patch or official fix information is provided in the available data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the registration endpoint and monitor for unauthorized changes if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-08-14T14:08:13.288Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a85eb30acd9273b49667220
Added to database: 08/19/2026, 17:43:12 UTC
Last enriched: 09/11/2026, 07:32:08 UTC
Last updated: 10/04/2026, 10:02:26 UTC
Views: 69
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