{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-09-29T21:07:38.670","vulnerabilities":[{"cve":{"id":"CVE-2026-26973","sourceIdentifier":"security-advisories@github.com","published":"2026-02-26T20:31:37.327","lastModified":"2026-06-17T10:26:28.087","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"Discourse is an open source discussion platform. Versions prior to 2025.12.2, 2026.1.1, and 2026.2.0 have an IDOR (Insecure Direct Object Reference) in `ReviewableNotesController`. When `enable_category_group_moderation` is enabled, a user belonging to a  category moderation group can create or delete their own notes on **any** reviewable in the system, including reviewables in categories they do not moderate. The controller used an unscoped `Reviewable.find` and the `ensure_can_see` guard only checked whether the user could access the review queue in general, not whether they could access the specific reviewable. Only instances with `enable_category_group_moderation` enabled are affected. Staff users (admins/moderators) are not impacted as they already have access to all reviewables. The issue is patched in versions 2025.12.2, 2026.1.1, and 2026.2.0 by scoping the reviewable lookup through `Reviewable.viewable_by(current_user)`. As a workaround, disable the `enable_category_group_moderation` site setting. This removes the attack surface as only staff users will have access to the review queue."},{"lang":"es","value":"Discourse es una plataforma de discusión de código abierto. Versiones anteriores a 2025.12.2, 2026.1.1 y 2026.2.0 tienen una IDOR (Referencia Directa Insegura a Objeto) en `ReviewableNotesController`. Cuando `enable_category_group_moderation` está habilitado, un usuario que pertenece a un grupo de moderación de categoría puede crear o eliminar sus propias notas en cualquier elemento revisable del sistema, incluyendo elementos revisables en categorías que no modera. El controlador usó un `Reviewable.find` sin ámbito y la protección `ensure_can_see` solo verificaba si el usuario podía acceder a la cola de revisión en general, no si podía acceder al elemento revisable específico. Solo las instancias con `enable_category_group_moderation` habilitado se ven afectadas. Los usuarios del personal (administradores/moderadores) no se ven afectados ya que ya tienen acceso a todos los elementos revisables. El problema está parcheado en las versiones 2025.12.2, 2026.1.1 y 2026.2.0 al limitar la búsqueda de elementos revisables a través de `Reviewable.viewable_by(current_user)`. Como solución alternativa, deshabilite la configuración del sitio `enable_category_group_moderation`. Esto elimina la superficie de ataque ya que solo los usuarios del personal tendrán acceso a la cola de revisión."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"discourse","product":"discourse","versions":[{"version":"< 2025.12.2","status":"affected"},{"version":">= 2026.1.0-latest, < 2026.1.1","status":"affected"},{"version":">= 2026.2.0-latest, < 2026.2.0","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","baseScore":4.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":1.4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-02-26T20:40:10.083850Z","id":"CVE-2026-26973","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-863"}]},{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-639"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*","versionEndExcluding":"2025.12.0","matchCriteriaId":"6DB837D7-28C8-4E0F-B55F-AAAA36F32035"},{"vulnerable":true,"criteria":"cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*","versionStartIncluding":"2026.1.0","versionEndExcluding":"2026.1.1","matchCriteriaId":"1CAFCC9D-53D7-4017-85A5-EE6CA5A6A11C"},{"vulnerable":true,"criteria":"cpe:2.3:a:discourse:discourse:2026.2.0:*:*:*:latest:*:*:*","matchCriteriaId":"BB002FDC-BC71-4C46-8AAF-A34EC717E0E7"}]}]}],"references":[{"url":"https://github.com/discourse/discourse/security/advisories/GHSA-c587-qx78-vhmx","source":"security-advisories@github.com","tags":["Vendor Advisory"]}]}}]}