CVE-2026-59828

MEDIUM 5.3

Discourse: Hidden post revisions leak through adjacent visible diffs

CVSS Score

5.3

EPSS Score

0.3%

EPSS Percentile

23th

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.

CWE	CWE-200
Vendor	discourse
Product	discourse
Published	Jul 9, 2026
Last Updated	Jul 10, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

discourse / discourse

>= 2026.1.0-latest, < 2026.1.5 >= 2026.4.0-latest, < 2026.4.2 >= 2026.5.0-latest, < 2026.5.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗