Vulnerability Report

CVE-2026-59828

Title: Information Leak in Post Revisions

Information Disclosure

Proof Of Concept

No public PoC currently indexed for CVE-2026-59828.

CWE Category CWE-200

Published Date Jul 09, 2026

Modified Date Jul 13, 2026

Exploit Status Not Found

Score 5.3 CVSS v3.1

Exploit Probability (EPSS)

0.31%

Vulnerability Summary

CVE-2026-59828: 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.

Impacted Vendors

discourse 1

Reference Links

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 https://github.com/discourse/discourse/security/advisories/GHSA-q456-4f8q-42vx

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

5.3

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-59828 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

July 13, 2026 MODIFIED

Vulnerability data updated via NVD.

July 10, 2026 MODIFIED

Vulnerability data updated via NVD.

July 09, 2026 MODIFIED

Vulnerability data updated via NVD.

July 09, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


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

Affected Stack

No specific products linked.