CVE-2025-34291 KEV
Patch first
On CISA KEV — known exploited in the wild, due 2026-06-04.
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.
Scoring
| CVSS | 8.8 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 92.81% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-346 |
| On CISA KEV | yes — remediate by 2026-06-04 |
| Public exploit | none known |
| Published | 2025-12-05 |
| Last modified | 2026-07-14 |
CISA KEV
| Name | Langflow Origin Validation Error Vulnerability |
|---|---|
| Added | 2026-05-21 |
| Due | 2026-06-04 |
| Vendor / product | Langflow / Langflow |
| Ransomware use | none reported |
Affected (1)
| Vendor | Product |
|---|---|
| langflow | langflow |
References
- https://github.com/langflow-ai/langflow
- https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform
- https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34291
- https://www.crowdsec.net/vulntracking-report/cve-2025-34291
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