Langflow OSS: Remote code execution by authenticated users via code injection
Summary
IBM Langflow OSS versions 1.0.0 through 1.12.2 contain a code injection flaw (CWE-94) that allows a remote attacker with a valid account to execute arbitrary code. Successful exploitation runs code with the privileges of the Langflow service, which can expose stored API keys, model credentials and data. IBM rates the issue at CVSS 8.8 and recommends upgrading to version 1.12.3.
Affected
- IBM Langflow OSS 1.0.0 through 1.12.2
Fixed in
- Upgrade to Langflow OSS 1.12.3 (named by IBM as the remediation release). Check IBM's bulletin for later releases, as a newer advisory lists 1.12.3 as affected.
Workaround
Unknown. IBM documents no workaround.
Exploitation
- No known exploitation and no public proof-of-concept as of the research notes.
- Not listed in CISA KEV.
- CISA SSVC: exploitation none, automatable no, technical impact total.
Our recommendation
- Inventory all Langflow OSS instances, including test and demo systems, and record their versions.
- Upgrade to at least 1.12.3, or the newest release supported by IBM's bulletin.
- Restrict network access to Langflow and remove unneeded user accounts.
- Check whether instances on 1.12.2 or earlier were reachable from untrusted networks, and review logs for unexpected workflow edits or child processes.
- Rotate API keys and credentials stored in or accessible to Langflow if exposure is suspected.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- IBM Security Bulletin www.ibm.com
- OSV: CVE-2026-93443 osv.dev
- VulDB: CVE-2026-93443 vuldb.com
- GBHackers: IBM patches multiple Langflow OSS flaws gbhackers.com
- CyberPress: IBM patches critical Langflow vulnerabilities cyberpress.org
- SecurityOnline: Langflow vulnerabilities 1.12.3 securityonline.info
- OpenCVE: CVE-2026-93443 app.opencve.io
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 21:32.
Original description (NVD)
IBM Langflow OSS 1.0.0 through 1.12.2 could allow a remote authenticated attacker to execute arbitrary code due to improper neutralization of special elements used in code.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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