PT-2026-26715 · Discourse · Discourse

Davidtaylorhq · Published 2026-03-20 · Updated 2026-03-27 · CVE-2026-33427

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Discourse versions prior to 2026.3.0-latest.1 Discourse versions prior to 2026.2.1 Discourse versions prior to 2026.1.2

Description Discourse is an open-source discussion platform. An unauthenticated attacker can manipulate a legitimate Discourse authorization page to display a domain controlled by the attacker. This can be used to conduct social engineering attacks against users.

Recommendations Update Discourse to version 2026.3.0-latest.1 or later. Update Discourse to version 2026.2.1 or later. Update Discourse to version 2026.1.2 or later.

Exploit

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

BIT-DISCOURSE-2026-33427

CVE-2026-33427

GHSA-9VHG-2MX3-MQFR

Affected Products

Discourse

References · 6

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33427.json · Exploit
• https://github.com/discourse/discourse/security/advisories/GHSA-9vhg-2mx3-mqfr · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33427 · Security Note
• https://osv.dev/vulnerability/BIT-discourse-2026-33427 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-33427 · Vendor Advisory
• https://twitter.com/CVEnew/status/2035262106019180861 · Twitter Post