Is CVE-2026-55255 in the CISA KEV catalog?

Yes. CVE-2026-55255 is on the CISA Known Exploited Vulnerabilities list, added 2026-07-07.

What is the CVSS severity of CVE-2026-55255?

CVE-2026-55255 has a CVSS v3 base score of 8.4 (HIGH).

What is the EPSS score for CVE-2026-55255?

CVE-2026-55255 has an EPSS score of 0.56% (43th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-55255?

Upgrade langflow to 1.9.2 or later.

CVE & CISA-KEV Catalog

CVE-2026-55255

HIGHCISA KEV

8.4

CVSS v3

NVD

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.

CWE-639Authorization Bypass Through User-Controlled Key

How to fix

Remediation Available

langflowNVD

Affected:< 1.9.2Fixed in:1.9.2CVE-2026-55255derived from NVD

Affected:< 1.9.1Fixed in:1.9.1CVE-2026-55255derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityLow

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

Exploit Intelligence

0.56%probability of exploitation in 30 days

43rdpercentile

Moderate risk: more likely to be exploited than 43% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-07-10

References

Patch2

Exploit1

github.com

Third-Party Advisory1

webflow.sysdig.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-639 (Authorization Bypass Through User-Controlled Key) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-6875	Critical	9.8	90%	-	-
CVE-2024-46982	High	7.5	59%	-	Fix
CVE-2021-45428	Critical	9.8	57%	-	-
CVE-2019-17382	Critical	9.1	54%	-	Fix
CVE-2019-13360	Critical	9.8	24%	-	-
CVE-2023-48783	Medium	5.4	22%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-08.