Description
Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, post revisions that should be hidden from regular users could be leaked through visible diffs on adjacent revisions serialized by PostRevisionSerializer. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
discourse discourse
>= 2026.1.0-latest, < 2026.1.5affected>= 2026.4.0-latest, < 2026.4.2affected>= 2026.5.0-latest, < 2026.5.1affected
References
- https://github.com/discourse/discourse/security/advisories/GHSA-q456-4f8q-42vx ↗
- https://github.com/discourse/discourse/commit/1f26c1163ce87a2abbd1d01780ab1b5fb16e75f6 ↗
- https://github.com/discourse/discourse/commit/8b773332b0f937dfcd894ed56d56fc5a81578d9d ↗
- https://github.com/discourse/discourse/commit/8d36da1b68c906592abde3f2e94d505cdf097435 ↗
- https://github.com/discourse/discourse/commit/d58988d46bb1019bfa8b8330ae81a1a134e08511 ↗
- https://github.com/discourse/discourse/releases/tag/v2026.1.5 ↗
- https://github.com/discourse/discourse/releases/tag/v2026.4.2 ↗
- https://github.com/discourse/discourse/releases/tag/v2026.5.1 ↗
- https://github.com/discourse/discourse/releases/tag/v2026.6.0 ↗