CVE-2026-12763 | BDVDB-2026-372500 Detail

IBMLangflow OSS

Description#

IBM Langflow OSS 1.0.0 through 1.11.5 could allow an authenticated attacker to access another user's MCP server context due to improper cache key isolation in the MCP Tools component.

Impact#

Per CVSS v3.1: confidentiality impact low, integrity impact low, availability impact none. Attack vector: network.

Weaknesses#

CWE-306 Missing Authentication for Critical Function

References#

https://www.ibm.com/support/pages/node/7286662

Exploit#

No public exploit known

History#

Version 12026-09-14Record published in the CVE List.
Version 22026-09-15Most recent update recorded in the CVE List.

Published

Published: 2026-09-14
Last modified: 2026-09-15

Vendor information

Vendor: IBM
Product: Langflow OSS

All IBM vulnerabilities

Score

4.2 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 8.5.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Authentication Issues

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 1.0.0 and <= 1.11.5
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

4.2 Medium

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Metric breakdown
Attack Vector	Network
Attack Complexity	High
Privileges Required	Low
User Interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity	Low
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).