CVE-2025-34291 (GCVE-0-2025-34291)

Vulnerability from cvelistv5 – Published: 2025-12-05 22:27 – Updated: 2026-05-22 03:55
VLAI CISA KEV
Title
Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE
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.
Severity
9.4 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CWE
  • CWE-346 - Origin Validation Error
Assigner
References
Impacted products
Vendor Product Version
Langflow Langflow Affected: 0 , ≤ 1.6.9 (semver)
Create a notification for this product.
Credits
Fenix Qiao (aka 13ph03nix) from Obsidian Security Shuyang Wang from Obsidian Security
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 3de6464b-7f59-4e0e-a407-d5f8c516ea1e

Vulnerability ID: CVE-2025-34291

Status: Confirmed

Status Updated: 2026-05-21 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-05-21
Asserted: 2026-05-21
Scope
Notes: KEV entry: Langflow Origin Validation Error Vulnerability | Affected: Langflow / Langflow | 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: 2026-06-04 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-346
Feed CISA Known Exploited Vulnerabilities Catalog
Product Langflow
Due Date 2026-06-04
Date Added 2026-05-21
Vendorproject Langflow
Vulnerabilityname Langflow Origin Validation Error Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-05-22 17:00 UTC | Updated: 2026-05-22 17:00 UTC
Show details on NVD website
To clipboard 

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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Detection rules are retrieved from Rulezet.