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High severity7.5OSV Advisory· Published Jan 28, 2026· Updated Jun 17, 2026

CVE-2026-23743

CVE-2026-23743

Description

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, permalinks pointing to access-restricted resources (private topics, categories, posts, or hidden tags) were redirecting users to URLs containing the resource slug, even when the user didn't have access to view the resource. This leaked potentially sensitive information (e.g., private topic titles) via the redirect Location header and the 404 page's search box. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. No known workarounds are available.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

6
  • Discourse (software)/DiscourseOSV5 versions
    beta, latest-release, release, …+ 4 more
    • (no CPE)range: beta, latest-release, release, …
    • cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:*range: <3.5.4
    • cpe:2.3:a:discourse:discourse:2025.12.0:*:*:*:stable:*:*:*
    • cpe:2.3:a:discourse:discourse:2026.1.0:*:*:*:stable:*:*:*
    • (no CPE)range: <3.5.4, <2025.11.2, <2025.12.1, <2026.1.0
  • osv-coords
    pkg:bitnami/discourse
    Range: < 3.5.4

Patches

Vulnerability mechanics

References

1

News mentions

0

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