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cve recordhighexploited in the wild3 of 3 cataloguesexploit reported

CVE-2026-55255

Langflow · Langflow · Langflow Authorization Bypass Through User-Controlled Key Vulnerability

Published · Added to CISA KEV
CVSS8.4
Severityhigh
WeaknessCWE-639
EPSS0.89%58.8th percentile
Exploited3 KEV sources
Ransomware useUnknown
Federal fix dueJul 10, 2026

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

patch window

Called exploited 3 days after disclosure.

Measured from the CVE publication date to the earliest of 3 KEV catalogues that list it.

The life of this vulnerability

  1. CVE published
  2. First KEV listing3d
  3. Last KEV listing11d
  4. Last sighting52d

Gaps are compressed to equal steps. The elapsed time is printed under each.

Which catalogues call it exploited

Sources3 of 3
Listings differ by11 d
Strongest claimconfirmed

3 catalogues list it. CIRCL aggregates the others and is shown but not counted.

Public exploitation evidence

8 public reports collected from VulnCheck and CIRCL, first on Jun 26, 2026. Each links to its original source. We have not verified them.

Description

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.

Required action (CISA)

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

References

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Our coverage of CVE-2026-55255

CVE-2008-4128high

July 2026 CVE Landscape

Cybersecurity researchers identified 85 high-impact vulnerabilities in July 2026 that require urgent remediation, marking a 44% increase from the previous month. Of these, 36 were assigned a "Very Critical" risk score by Insikt Group. The vulnerabilities affected products from 61 vendors, with Microsoft accounting for approximately 12% of the total.

CVE-2026-55255critical

Attackers using Langflow flaw for credential harvesting (CVE-2026-55255)

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added a critical vulnerability in the Langflow AI framework to its Known Exploited Vulnerabilities catalog. This flaw, identified as CVE-2026-55255, has been observed being actively exploited in the wild by threat actors.

CVE-2026-48282critical

U.S. CISA adds Adobe ColdFusion, Joomlack Page Builder, Langflow, and JoomShaper SP Page Builder flaws to its Known Exploited Vulnerabilities catalog

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added four vulnerabilities affecting Adobe ColdFusion, Joomlack Page Builder, Langflow, and JoomShaper SP Page Builder to its Known Exploited Vulnerabilities (KEV) catalog. This directive mandates that federal agencies patch these vulnerabilities by July 10, 2026, to mitigate risks from active exploitation. Private…

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Texas Parks and Wildlife, WordPress Plugin Vendor Hit by Data Breaches

The Texas Parks and Wildlife Department has confirmed a data breach affecting its hunting and fishing license system vendor, exposing personal information for over 3 million customers. Separately, ShapedPlugin, a vendor of WordPress plugins, suffered a supply chain attack that delivered malicious updates to its paid plugins.

CVE-2026-20245high

29th June – Threat Intelligence Report

A recent threat intelligence report has detailed a range of cyber incidents, from supply chain attacks and data breaches affecting major companies to the exploitation of artificial intelligence technologies for malicious purposes. The report highlights the ongoing evolution of cyber threats, emphasizing the need for robust security measures across various sectors.