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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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:16e93ad52403c607bf782502a39d1beba04f92b8c078870b327f9a3fdaa31b5e
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"discourse","vendor":"discourse","versions":[{"status":"affected","version":">= 2026.1.0-latest, < 2026.1.5"},{"status":"affected","version":">= 2026.4.0-latest, < 2026.4.2"},{"status":"affected","version":">= 2026.5.0-latest, < 2026.5.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c0dfd966fac5c1db142e62317bd5c6cd94ecaaa5df556b8077adfeec7004ff06 · sha256:bb84e6dbe98110bb… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c0dfd966fac5c1db142e62317bd5c6cd94ecaaa5df556b8077adfeec7004ff06 · sha256:bb84e6dbe98110bb… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-200","description":"CWE-200: Exposure of Sensitive Information to an Unauthorized Actor","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c0dfd966fac5c1db142e62317bd5c6cd94ecaaa5df556b8077adfeec7004ff06 · sha256:bb84e6dbe98110bb… · /containers/cna/problemTypes/0/descriptions/0

Source references

9 source assertions
{"name":"https://github.com/discourse/discourse/commit/1f26c1163ce87a2abbd1d01780ab1b5fb16e75f6","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/1f26c1163ce87a2abbd1d01780ab1b5fb16e75f6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c0dfd966fac5c1db142e62317bd5c6cd94ecaaa5df556b8077adfeec7004ff06 · sha256:bb84e6dbe98110bb… · /containers/cna/references/1
{"name":"https://github.com/discourse/discourse/commit/8b773332b0f937dfcd894ed56d56fc5a81578d9d","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/8b773332b0f937dfcd894ed56d56fc5a81578d9d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c0dfd966fac5c1db142e62317bd5c6cd94ecaaa5df556b8077adfeec7004ff06 · sha256:bb84e6dbe98110bb… · /containers/cna/references/2
{"name":"https://github.com/discourse/discourse/commit/8d36da1b68c906592abde3f2e94d505cdf097435","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/8d36da1b68c906592abde3f2e94d505cdf097435"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c0dfd966fac5c1db142e62317bd5c6cd94ecaaa5df556b8077adfeec7004ff06 · sha256:bb84e6dbe98110bb… · /containers/cna/references/3
{"name":"https://github.com/discourse/discourse/commit/d58988d46bb1019bfa8b8330ae81a1a134e08511","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/d58988d46bb1019bfa8b8330ae81a1a134e08511"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c0dfd966fac5c1db142e62317bd5c6cd94ecaaa5df556b8077adfeec7004ff06 · sha256:bb84e6dbe98110bb… · /containers/cna/references/4
{"name":"https://github.com/discourse/discourse/releases/tag/v2026.1.5","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/releases/tag/v2026.1.5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c0dfd966fac5c1db142e62317bd5c6cd94ecaaa5df556b8077adfeec7004ff06 · sha256:bb84e6dbe98110bb… · /containers/cna/references/5
{"name":"https://github.com/discourse/discourse/releases/tag/v2026.4.2","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/releases/tag/v2026.4.2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c0dfd966fac5c1db142e62317bd5c6cd94ecaaa5df556b8077adfeec7004ff06 · sha256:bb84e6dbe98110bb… · /containers/cna/references/6
{"name":"https://github.com/discourse/discourse/releases/tag/v2026.5.1","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/releases/tag/v2026.5.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c0dfd966fac5c1db142e62317bd5c6cd94ecaaa5df556b8077adfeec7004ff06 · sha256:bb84e6dbe98110bb… · /containers/cna/references/7
{"name":"https://github.com/discourse/discourse/releases/tag/v2026.6.0","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/releases/tag/v2026.6.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c0dfd966fac5c1db142e62317bd5c6cd94ecaaa5df556b8077adfeec7004ff06 · sha256:bb84e6dbe98110bb… · /containers/cna/references/8
{"name":"https://github.com/discourse/discourse/security/advisories/GHSA-q456-4f8q-42vx","tags":["x_refsource_CONFIRM"],"url":"https://github.com/discourse/discourse/security/advisories/GHSA-q456-4f8q-42vx"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c0dfd966fac5c1db142e62317bd5c6cd94ecaaa5df556b8077adfeec7004ff06 · sha256:bb84e6dbe98110bb… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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