> CVE-2026-55255 [CRITICAL]

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PUBLISHED
2026-06-23 17:17
MODIFIED
2026-06-23 18:18
CVSS_SCORE V3
9.9
EPSS (Prob. Exploit)
0.89%
Top 40.7%
⚠ CISA_KEV
DATA SOURCES:
NVD 🔗 2026-06-23 CISA KEV 🔗 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-11-01 GITHUB 🔗 2026-11-05 OSV 🔗 2026-11-02

> DESCRIPTION

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.2, an Insecure Direct Object Reference (IDOR) vulnerability in /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request. This vulnerability is fixed in 1.9.2.

> AFFECTED_PRODUCTS

Langflow - Langflow

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
EXPLOITABILITY
3.1
IMPACT
6.0

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
Low (L)
Authentifié avec compte utilisateur basique
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Changed (C)
Impact s'étend au-delà du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
High (H)
Divulgation totale d'informations
I (Impact Intégrité)
Integrity Impact
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
Low (L)
Interruption partielle du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
High
Divulgation totale d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
Low
Interruption partielle du service possible

> WEAKNESSES

CWE-639

> CWE DETAILED DESCRIPTIONS

CWE-639: Authorization Bypass Through User-Controlled Key - The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

> GITHUB SECURITY ADVISORY

GHSA-qrpv-q767-xqq2 HIGH

Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow

AFFECTED PACKAGES:
PIP / langflow
< 1.9.1
Fixed in: 1.9.1

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow

AFFECTED PACKAGES:
Unknown / Unknown
169 versions affected
ALIASES:
GHSA-qrpv-q767-xqq2, PYSEC-2026-221

> HISTORIQUE DES MODIFICATIONS

Première apparition
23/06/2026 17:17
Source: NVD
📊 ENRICHISSEMENT 07/07/2026 17:15
KEV
Champ modifié: Catalogue KEV
Ancienne valeur:
Non
Nouvelle valeur:
Oui
📊 ENRICHISSEMENT 01/07/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-639: Authorization Bypass Through User-Controlled Key - The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key...
Total des modifications: 2 Dernière mise à jour: 3 months ago

> REFERENCES

https://github.com/langflow-ai/langflow/pull/12832
https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2
https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2
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