CVE-2026-28227

lowpriority · track · 12OT risk · elevatedEPSS 0.033 · 88 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

3.25% (88th) EPSS

CVSS 2.7 · low

Is it mine?

8 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-27

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, TL4 users can publish topics into staff-only categories via the `publish_to_category` topic timer, bypassing authorization checks. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.

cvss

Technical severity, 0–10. One row per scoring source.

2.7

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.12.7lowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:Nprimary · NVD / NIST USexploitability 1.2 · impact 1.4

v4.01.2lowCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:Usecondary · ENISA EU

v4.01.2lowCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · security-advisories@github.com

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-863US

affected products (8)

Products and version ranges known to be affected.

discourse discourse≤ < 2025.12.2enisa_euvdEU
discourse discourse2026.1.0-latest, → 2026.1.1enisa_euvdEU
discourse discourse2026.2.0-latest, → 2026.2.0enisa_euvdEU
discourse discourse< 2025.12.2nvdUScpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*
discourse discourse2026.1.0 → 2026.1.1nvdUScpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*
discourse discourse= 2026.2.0nvdUScpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*
Bitnami discourse< 2025.12.2osvUSpkg:bitnami/discourse
Bitnami discourse2026.1.0 → 2026.1.1osvUSpkg:bitnami/discourse

advisories (1)

Vendor and ecosystem advisories describing this.

BIT-discourse-2026-28227Discourse Vulnerable to Unauthorized Topic Creation in Staff-Only Categories via Topic Timer publish_to_category2026-03-03vendor · osvUS
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, TL4 users can publish topics into staff-only categories via the `publish_to_category` topic timer, bypassing authorization checks. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv nvd NVD CVE.org MITRE

published 2026-02-26modified 2026-06-17

references (5)

External citations — patches, advisories, analysis.

scry

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