CVE-2026-26265
Discourse is an open source discussion platform.
Published Feb 26, 2026 · updated Jun 17, 2026 · discourse discourse
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, an IDOR vulnerability in the directory items endpoint allows any user, including anonymous users, to retrieve private user field values for all users in the directory. The parameter in accepts arbitrary user field IDs without authorization checks, bypassing the visibility restrictions ( / ) that are enforced elsewhere (e.g., via ). An attacker can request with any private field ID and receive that field's value for every user in the directory response. This enables bulk exfiltration of private user data such as phone numbers, addresses, or other sensitive custom fields that admins have explicitly configured as non-public. The issue is patched in versions 2025.12.2, 2026.1.1, and 2026.2.0 by filtering against for non-staff users before building the custom field map. As a workaround, site administrators can remove sensitive data from private user fields, or disable the user directory via the site setting.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Feb 26, 2026 · NIST NVD
Detected
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, an IDOR vulnerability in the directory items endpoint allows any user, including anonymous users, to retrieve private user field values for all users in the directory. The parameter in accepts arbitrary user field IDs without authorization checks, bypassing the visibility restrictions ( / ) that a
Jun 17, 2026 · NIST NVD
Updated
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, an IDOR vulnerability in the directory items endpoint allows any user, including anonymous users, to retrieve private user field values for all users in the directory. The parameter in accepts arbitrary user field IDs without authorization checks, bypassing the visibility restrictions ( / ) that a
Affected
- cpe discourse/discourseversion unspecified
- cpe discourse/discourse2026.2.0
Sources
- CVE.orgVulnerability recordCVE-2026-26265
Official CVE identifier
cve.org - NIST NVDVulnerability recordCVE-2026-26265
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, an IDOR vulnerability in the directory items endpoint allows any user, including anonymous users, to retrieve private user field values for all users in the directory. The `user_
nvd.nist.gov