Advisory details:
vulnrichment / CVE-2025-34291
| Advisory ID | vulnrichment/CVE-2025-34291 |
| Aliases | |
| Summary | 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. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 0.0 |
| Risk | |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| CWE-346 | Origin Validation Error |
| System | Score | Found at |
|---|---|---|
| cvssv4 | 9.4 | |
| ssvc | Attend |
| Reference id | Reference type | URL |
|---|---|---|
| https://github.com/langflow-ai/langflow | ||
| https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce | ||
| CVE-2025-34291-CRITICAL-ACCOUNT-TAKEOVER-AND-RCE-VULNERABILITY-IN-THE-LANGFLOW-AI-AGENT-WORKFLOW-PLATFORM | https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform |
| Data source | KEV |
|---|---|
| Date added | May 21, 2026 |
| Description | Langflow contains an origin validation error vulnerability in which an overly permissive CORS configuration 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. This could allow the attacker to execute arbitrary code and achieve full system compromise via obtained tokens that permit access to authenticated endpoints. |
| Required action | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. |
| Due date | June 4, 2026 |
| Note | This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/langflow-ai/langflow ; https://github.com/langflow-ai/langflow/releases/tag/v1.9.3; https://github.com/langflow-ai/langflow/issues/11465#event-25774545848 ; https://nvd.nist.gov/vuln/detail/CVE-2025-34291 |
| Ransomware campaign use | Unknown |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Attack Requirements (AT) | Privileges Required (PR) | User Interaction (UI) | Vulnerable System Impact Confidentiality (VC) | Vulnerable System Impact Integrity (VI) | Vulnerable System Impact Availability (VA) | Subsequent System Impact Confidentiality (SC) | Subsequent System Impact Integrity (SI) | Subsequent System Impact Availability (SA) |
|---|---|---|---|---|---|---|---|---|---|---|
network adjacent local physical |
low high |
none present |
none low high |
none passive active |
high low none |
high low none |
high low none |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:A/A:N/T:T/P:M/B:A/M:M/D:A/2026-05-21T19:39:27Z/
Decision: Attend
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2025/34xxx/CVE-2025-34291.json
Source Advisory: vulnrichment/CVE-2025-34291
[{'Exploitation': 'active'},
{'Automatable': 'no'},
{'Technical Impact': 'total'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]