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Description

Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise.

PUBLISHED Reserved 2025-04-15 | Published 2025-12-05 | Updated 2026-05-22 | Assigner VulnCheck




CRITICAL: 9.4CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CISA Known Exploited Vulnerability

Date added 2026-05-21 | Due date 2026-06-04

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Problem types

CWE-346 Origin Validation Error

Product status

Default status
unaffected

Any version
affected

Credits

Fenix Qiao (aka 13ph03nix) from Obsidian Security finder

Shuyang Wang from Obsidian Security finder

References

www.crowdsec.net/vulntracking-report/cve-2025-34291 third-party-advisory

www.cisa.gov/...erabilities-catalog?field_cve=CVE-2025-34291 government-resource

www.obsidiansecurity.com/...gflow-ai-agent-workflow-platform technical-description exploit

github.com/langflow-ai/langflow product

www.vulncheck.com/...isconfiguration-to-token-hijack-and-rce third-party-advisory

cve.org (CVE-2025-34291)

nvd.nist.gov (CVE-2025-34291)

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