ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2026-26265

Discourse is an open source discussion platform.

Published Feb 26, 2026 · catalog updated Jun 17, 2026 · Discourse is an open

Check if you run it

No confirmed exploitation is on record for CVE-2026-26265. EPSS is 1.48%. Act only if a listed version of Discourse is an open is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Discourse is an open).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.48%
Remediation
Advisory link
Affected products
cpe 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe discourse/discourse2026.2.0

How to fix CVE-2026-26265

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-26265. EPSS is 1.48%. Act only if a listed version of Discourse is an open is installed.

Which versions are affected?

Compare what you have installed with 2026.2.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-639: Authorization Bypass Through User-Controlled Key; CWE-863: Incorrect Authorization. EPSS 1.48%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. 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

  2. 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

Sources

  • CVE.orgVulnerability recordCVE-2026-26265

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-26265

    30-day exploitation probability 1.5%

    first.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

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.