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CVE-2026-55255

88
FAUCET Score

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, 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 1.9.1.

First published: Jun 23, 2026Last modified: Jul 7, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 1.9.1CPE matchmatch criteria
cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.4HIGH

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
LOW
Exploitability Score
1.8
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
29.05%
Probability of exploitation in next 30 days
EPSS Percentile
98.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
Added to KEV · Jul 7, 2026
This CVE's current EPSS score of 0.2905 is in the 97th percentile among its peer group of 17,823 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: langflowFixed in: 1.9.1

Vendor Advisories (1)

pipGHSA-qrpv-q767-xqq2high

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

Jun 19, 2026

References

webflow.sysdig.com / blog/understanding-langflow-cve-2026-55255-and-why-higher-cvss-vulnerabilities-arent-always-the-most-exploited
Third Party Advisory
cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
github.com / langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060e
Patch
github.com / langflow-ai/langflow/pull/12832
Issue TrackingPatch
github.com / langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2
ExploitMitigationVendor Advisory