Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a security flaw in the discourse-policy plugin which allowed a user with policy creation permission to gain membership access to any private/restricted groups. Once membership to a private/restricted group has been obtained, the user will be able to read private topics that only the group has access to. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, review all policies for the use of add-users-to-group and temporarily remove the attribute from the policy. Alternatively, disable the discourse-policy plugin by disabling the policy_enabled site setting.
CVE-2026-28282
“—” beside the score: it is equal to NVD's CVSS score.
This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.3% (28th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-13243 (ENISA EUVD)Source: ENISA EUVD
- Lower severity and no public exploit yet
A fix is available — apply it.
- CVSS v3
- 6.5
- EG Score
- 6.5MEDIUMmedium confidence
- EG Risk
- 29EG Risk 29/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity65% × 45%Impact severity (EG Severity): CVSS 6.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.4% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 0.3%
- EPSS %ILE
- 28th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (6.5): severity, escalated by confirmed exploitation. This CVE's 6.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 6.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
- EG Likelihood
- 0.3% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.
A fix is available. Apply it within your standard update timelines.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
March 19, 2026
Last Modified
June 17, 2026
Advisory Details (4)
Auto-updated Aug 6, 2026Group membership addition permission bypass via discourse-policy plugin · Advisory · discourse/discourse · GitHub
https://github.com/discourse/discourse/security/advisories/GHSA-6cc8-x3rm-j5pfcommit dcde9de530f5 (discourse/discourse)
Patch available: discourse/discourse _gh-attach-assets (contains commit dcde9de530f5)
https://github.com/discourse/discourse/commit/dcde9de530f515e88f99957056ffbcc2e1e03951commit c14b8a4cc5fc (discourse/discourse)
Fix landed in discourse/discourse commit c14b8a4cc5fc — awaiting tagged release
https://github.com/discourse/discourse/commit/c14b8a4cc5fc94e4839a83c5d55765897589f45bcommit 64e2514ac170 (discourse/discourse)
Fix landed in discourse/discourse commit 64e2514ac170 — awaiting tagged release
https://github.com/discourse/discourse/commit/64e2514ac17046cfaa8bc68a3c5140bc40736addWeakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 8× in last 7d / 38× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 95 of 103 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 5 repeat rows among the latest 100 are merged into the row they repeat. The 8 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.3% · 28th percentile
- 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.3% · 28th percentile
- 2026-10-30 23:55 UTCOSV refresh
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 28th percentile
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-10-25 14:38 UTCEG score recompute
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-10-23 04:00 UTCEG score recompute
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
- 2026-10-18 03:50 UTCEG score recompute
- 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
- 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.4% · 35th percentile
- 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
- 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
- 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
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- 2026-10-12 16:16 UTCEG score recompute
- 2026-10-11 19:59 UTCEG score recompute
- 2026-10-11 17:12 UTCEG score recompute
- 2026-10-11 14:43 UTCEG score recompute
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-11 08:25 UTCOSV refresh
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-09-21 21:01 UTCOSV refresh
- 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-09-02 17:08 UTCOSV refresh
- 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-16 11:08 UTCEG score recompute
- 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-08-14 07:18 UTCEG score recompute
- 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-08-12 22:02 UTCEG score recompute
- 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-08-11 13:42 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-08-11 04:30 UTCEG score recompute
- 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-08-10 05:28 UTCEG score recompute
- 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-08-09 06:51 UTCEG score recompute
- 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-08-07 17:21 UTCEG score recompute
- 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-08-06 01:31 UTCEG score recompute
- 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.3% · 25th percentile
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Frequently asked(5)
What is CVE-2026-28282?
When was the CVE record for CVE-2026-28282 published?
Is CVE-2026-28282 actively exploited?
What is the CVSS score of CVE-2026-28282?
How do I remediate CVE-2026-28282?
Dependency Blast Radius
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