What is the CVSS score of CVE-2026-27579?

CVE-2026-27579 has a CVSS 3.1 base score of 7.4 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of COR are affected by CVE-2026-27579?

CollabPlatform contains a critical CORS misconfiguration that allows attackers to perform unauthorized actions on behalf of authenticated users from any website.

How to fix or mitigate CVE-2026-27579?

Within 24 hours: Identify all CollabPlatform instances and document which contain sensitive data; notify users of the vulnerability and advise against using the platform for confidential information until remediation is complete. Within 7 days: Implement WAF rules to restrict CORS headers and block requests with suspicious Origin headers; configure network segmentation to limit CollabPlatform access; contact vendor for timeline on patch availability. Within 30 days: Deploy vendor patch immediately upon release; conduct audit of access logs for exploitation indicators; implement Origin whitelist controls in application configuration.

COR CVE-2026-27579

HIGH

Origin Validation Error (CWE-346)

2026-02-21 security-advisories@github.com

CSRF Information Disclosure

7.4

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

7.4 HIGH

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:04 vuln.today

CVE Published

Feb 21, 2026 - 11:15 nvd

HIGH 7.4

DescriptionGitHub Advisory

CollabPlatform is a full-stack, real-time doc collaboration platform. In all versions of CollabPlatform, the Appwrite project used by the application is misconfigured to allow arbitrary origins in CORS responses while also permitting credentialed requests. An attacker-controlled domain can issue authenticated cross-origin requests and read sensitive user account information, including email address, account identifiers, and MFA status. The issue did not have a fix at the time of publication.

AnalysisAI

CollabPlatform's misconfigured CORS policy allows credentialed cross-origin requests from attacker-controlled domains, enabling unauthorized access to sensitive user account data including email addresses, account identifiers, and MFA status. All versions of the application are affected by this vulnerability, which remains unpatched and exploitable through simple web-based attacks requiring user interaction.

Technical ContextAI

Classified as CWE-346 (Origin Validation Error). CollabPlatform is a full-stack, real-time doc collaboration platform. In all versions of CollabPlatform, the Appwrite project used by the application is misconfigured to allow arbitrary origins in CORS responses while also permitting credentialed requests. An attacker-controlled domain can issue authenticated cross-origin requests and read sensitive user account information, including email address, account identifiers, and MFA status. The issue did not have a fix at the time of publication.