Unrated severityNVD Advisory· Published Jul 9, 2026· Updated Jul 10, 2026
Discourse: Hidden post revisions leak through adjacent visible diffs
CVE-2026-59828
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
2- Range: before 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5
Patches
Vulnerability mechanics
References
9- github.com/discourse/discourse/commit/1f26c1163ce87a2abbd1d01780ab1b5fb16e75f6mitrex_refsource_MISC
- github.com/discourse/discourse/commit/8b773332b0f937dfcd894ed56d56fc5a81578d9dmitrex_refsource_MISC
- github.com/discourse/discourse/commit/8d36da1b68c906592abde3f2e94d505cdf097435mitrex_refsource_MISC
- github.com/discourse/discourse/commit/d58988d46bb1019bfa8b8330ae81a1a134e08511mitrex_refsource_MISC
- github.com/discourse/discourse/releases/tag/v2026.1.5mitrex_refsource_MISC
- github.com/discourse/discourse/releases/tag/v2026.4.2mitrex_refsource_MISC
- github.com/discourse/discourse/releases/tag/v2026.5.1mitrex_refsource_MISC
- github.com/discourse/discourse/releases/tag/v2026.6.0mitrex_refsource_MISC
- github.com/discourse/discourse/security/advisories/GHSA-q456-4f8q-42vxmitrex_refsource_CONFIRM
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