VDB-375424 · CVE-2026-56277 · GHSA-m837-xvxr-vqwg

Flowise up to 3.1.1 Configuration index.ts getCorsOptions origin validation

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7.0	$0-$5k	1.33-

Summaryinfo

A vulnerability classified as critical was found in Flowise up to 3.1.1. Impacted is the function getCorsOptions of the file packages/server/src/controllers/text-to-speech/index.ts of the component Configuration Handler. Executing a manipulation can lead to origin validation. The identification of this vulnerability is CVE-2026-56277. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Flowise up to 3.1.1. It has been declared as critical. This vulnerability affects the function getCorsOptions of the file packages/server/src/controllers/text-to-speech/index.ts of the component Configuration Handler. The manipulation with an unknown input leads to a origin validation vulnerability. The CWE definition for the vulnerability is CWE-346. The product does not properly verify that the source of data or communication is valid. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Flowise before 3.1.2 sets Access-Control-Allow-Origin to a hardcoded wildcard (*) on its text-to-speech (TTS) generation endpoint (packages/server/src/controllers/text-to-speech/index.ts), independent of the server's configured CORS policy. This bypasses the server's otherwise restrictive default CORS configuration (getCorsOptions()) and allows any webpage to make cross-origin requests that trigger TTS generation using stored credentials, enabling drive-by cross-origin credential abuse.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-56277 since 06/20/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

Upgrading to version 3.1.2 eliminates this vulnerability.

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Productinfo

Name

Flowise

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Origin validation
CWE: CWE-346 / CWE-345
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Flowise 3.1.2

Timelineinfo

06/20/2026 CVE reserved
07/01/2026 +11 days Advisory disclosed
07/01/2026 +0 days VulDB entry created
07/01/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: GHSA-m837-xvxr-vqwg
Status: Confirmed

CVE: CVE-2026-56277 (🔒)
GCVE (CVE): GCVE-0-2026-56277
GCVE (VulDB): GCVE-100-375424

Entryinfo

Created: 07/01/2026 10:23
Changes: 07/01/2026 10:23 (68)
Complete: 🔍
Cache ID: 216::103