CVE-2026-55255

Q: How do I fix CVE-2026-55255?

Upgrade langflow to 1.9.2 or later.

Q: Is CVE-2026-55255 being actively exploited?

Yes. CVE-2026-55255 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2026-07-10. Treat it as a priority whatever its CVSS score says.

Q: How severe is CVE-2026-55255?

CVE-2026-55255 has a CVSS v3 base score of 8.4, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-55255 affect?

Published advisories record a fix for langflow (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGHCISA KEVEPSS 98th pctl

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

29.05%probability of exploitation in 30 days

98thpercentile

Very high risk: more likely to be exploited than 98% 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

Common questions

How do I fix CVE-2026-55255?

Upgrade langflow to 1.9.2 or later.

Is CVE-2026-55255 being actively exploited?

Yes. CVE-2026-55255 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2026-07-10. Treat it as a priority whatever its CVSS score says.

How severe is CVE-2026-55255?

CVE-2026-55255 has a CVSS v3 base score of 8.4, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-55255 affect?

Published advisories record a fix for langflow (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-55255

Markdown

[![CVE-2026-55255](https://tridentstack.com/cve/badge/CVE-2026-55255.svg)](https://tridentstack.com/cve/CVE-2026-55255)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-55255"><img src="https://tridentstack.com/cve/badge/CVE-2026-55255.svg" alt="CVE-2026-55255"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

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.