TinaCMS up to 2.5.1 CORS cors.ts cross-domain policy

CVSS Meta Temp Score
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CTI Interest Score
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4.7$0-$5k0.47

Summaryinfo

A vulnerability was found in TinaCMS up to 2.5.1 and classified as problematic. Affected by this vulnerability is an unknown functionality of the file packages/@tinacms/cli/src/next/vite/cors.ts of the component CORS. The manipulation results in cross-domain policy. This vulnerability was named CVE-2026-63123. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in TinaCMS up to 2.5.1. It has been classified as problematic. Affected is an unknown code of the file packages/@tinacms/cli/src/next/vite/cors.ts of the component CORS. The manipulation with an unknown input leads to a cross-domain policy vulnerability. CWE is classifying the issue as CWE-942. The product uses a cross-domain policy file that includes domains that should not be trusted. This is going to have an impact on confidentiality. CVE summarizes:

Tina is a headless content management system. Prior to 2.5.2, the TinaCMS CLI package's Vite dev server packages/@tinacms/cli/src/next/vite/cors.ts origin callback returns false for a disallowed origin but does not reject the request, and packages/@tinacms/cli/src/next/vite/plugins.ts still routes POST /media/upload/* to mediaRouter.handlePost. The upload code in packages/@tinacms/cli/src/next/commands/dev-command/server/media.ts writes attacker-controlled multipart contents inside the configured media root. A remote attacker can cause a developer's browser to submit this state-changing request by inducing the developer to visit an attacker-controlled page while tinacms dev is running. This issue is fixed in version 2.5.2.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-63123 since 07/15/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Upgrading to version 2.5.2 eliminates this vulnerability.

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Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 3.1
VulDB Temp Score: 3.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.5
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross-domain policy
CWE: CWE-942 / 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: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: TinaCMS 2.5.2

Timelineinfo

07/15/2026 CVE reserved
08/19/2026 +35 days VulDB entry created
08/20/2026 +0 days Advisory disclosed
08/20/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-63123 (🔒)
GCVE (CVE): GCVE-0-2026-63123
GCVE (VulDB): GCVE-100-393558

Entryinfo

Created: 08/20/2026 00:26
Changes: 08/20/2026 00:26 (64)
Complete: 🔍
Cache ID: 216::103

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