CVE Explorer
CVE-2026-27454
Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, requesting /posts/:id.json?version=X bypassed authorization checks on post revisions. The display_post method called post.revert_to directly without verifying whether the revision was hidden or if the user had permission to view edit history. This meant hidden revisions (intentionally concealed by staff) could be read by any user by simply enumerating version numbers. Starting in version
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, < 2026.1.2"},{"status":"affected","version":">= 2026.2.0-latest, < 2026.2.1"},{"status":"affected","version":"= 2026.3.0-latest"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:4449e82ce2fbd21c0e615fb3a7b9671414506d2841cecb42a4e6be837241ceb6 · sha256:a1ce2c567c160865… · /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_v5cvssurn:baitaphish:normalized-source-record:v2:4449e82ce2fbd21c0e615fb3a7b9671414506d2841cecb42a4e6be837241ceb6 · sha256:a1ce2c567c160865… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-862","description":"CWE-862: Missing Authorization","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:4449e82ce2fbd21c0e615fb3a7b9671414506d2841cecb42a4e6be837241ceb6 · sha256:a1ce2c567c160865… · /containers/cna/problemTypes/0/descriptions/0
Source references
4 source assertions{"name":"https://github.com/discourse/discourse/commit/8510fde30eb0d7f2dee822a95f6cf43b9ac943d0","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/8510fde30eb0d7f2dee822a95f6cf43b9ac943d0"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:4449e82ce2fbd21c0e615fb3a7b9671414506d2841cecb42a4e6be837241ceb6 · sha256:a1ce2c567c160865… · /containers/cna/references/1
{"name":"https://github.com/discourse/discourse/commit/c0eeb5892f5d61ad62b057f4d468333a6e9f28c3","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/c0eeb5892f5d61ad62b057f4d468333a6e9f28c3"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:4449e82ce2fbd21c0e615fb3a7b9671414506d2841cecb42a4e6be837241ceb6 · sha256:a1ce2c567c160865… · /containers/cna/references/2
{"name":"https://github.com/discourse/discourse/commit/c474fbd79d2bd231baafb4332970297d781f92ca","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/c474fbd79d2bd231baafb4332970297d781f92ca"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:4449e82ce2fbd21c0e615fb3a7b9671414506d2841cecb42a4e6be837241ceb6 · sha256:a1ce2c567c160865… · /containers/cna/references/3
{"name":"https://github.com/discourse/discourse/security/advisories/GHSA-fq69-f929-wp96","tags":["x_refsource_CONFIRM"],"url":"https://github.com/discourse/discourse/security/advisories/GHSA-fq69-f929-wp96"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:4449e82ce2fbd21c0e615fb3a7b9671414506d2841cecb42a4e6be837241ceb6 · sha256:a1ce2c567c160865… · /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.