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CVE-2026-59828
Discourse: Hidden post revisions leak through adjacent visible diffs
Medium5.3EPSS 0.55%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| NVDNVD · Analyzed | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.55% · top 54% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Weakness
Affected products
References (9)
- https://github.com/discourse/discourse/security/advisories/GHSA-q456-4f8q-42vx (opens in a new tab)x_refsource_CONFIRM
- https://github.com/discourse/discourse/commit/1f26c1163ce87a2abbd1d01780ab1b5fb16e75f6 (opens in a new tab)x_refsource_MISC
- https://github.com/discourse/discourse/commit/8b773332b0f937dfcd894ed56d56fc5a81578d9d (opens in a new tab)x_refsource_MISC
- https://github.com/discourse/discourse/commit/8d36da1b68c906592abde3f2e94d505cdf097435 (opens in a new tab)x_refsource_MISC
- https://github.com/discourse/discourse/commit/d58988d46bb1019bfa8b8330ae81a1a134e08511 (opens in a new tab)x_refsource_MISC
- https://github.com/discourse/discourse/releases/tag/v2026.1.5 (opens in a new tab)x_refsource_MISC
- https://github.com/discourse/discourse/releases/tag/v2026.4.2 (opens in a new tab)x_refsource_MISC
- https://github.com/discourse/discourse/releases/tag/v2026.5.1 (opens in a new tab)x_refsource_MISC
- https://github.com/discourse/discourse/releases/tag/v2026.6.0 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-59828)Record last updated .