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Discourse EUVDEUVD-2026-13488

| CVE-2026-30888 LOW
Improper Privilege Management (CWE-269)
2026-03-20 security-advisories@github.com
2.2
CVSS 3.1 · GitHub Advisory
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Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A01:2021 - Broken Access Control
ASVS 5.0
V4 - Access Control Authorization enforcement, RBAC validation
MITRE ATT&CK

1 technique across 1 tactic: Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Impact

The CVSS score of 2.2 reflects realistic constraints: the attack requires high privileges (PR:H—authenticated moderator account), high attack complexity (AC:H), and only impacts confidentiality minimally (C:L) with no availability impact. The attack vector is network-based (AV:N) but the high privilege requirement severely limits the threat actor pool. There is no evidence of active exploitation (KEV status not indicated as active), and the integrity impact appears limited to policy documents rather than user data. However, this is a real privilege escalation with concrete business impact—unauthorized modification of ToS and privacy policies could expose organizations to legal liability and user trust damage. The availability of patches for all supported versions (2026.3.0-latest.1, 2026.2.1, and 2026.1.2) reduces urgency, but the lack of workarounds means patching is mandatory.

Exploit ScenarioDerived

A disgruntled moderator with legitimate platform access could modify the site's Terms of Service or privacy policy to insert malicious terms, redirect users to phishing sites via policy links, or remove liability clauses without administrative approval. The attack requires network access (standard for web platforms) and an existing moderator account, but the high attack complexity suggests the authorization bypass may require specific conditions (e.g., timing, specific API endpoint usage, or role state). An administrator would likely notice policy document changes in audit logs, making this suitable for insider threats rather than mass exploitation.

Monitor Track and reassess. Why: LOW severity (CVSS 0.1-3.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 20, 2026

A privilege escalation vulnerability in Discourse allows moderators to edit site policy documents (Terms of Service, guidelines, privacy policy) despite explicit access restrictions, enabling unauthorized modification of critical site governance documents. This affects Discourse versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2. The vulnerability has a low CVSS score of 2.2 due to high attack complexity and privileged access requirement, but represents a clear integrity violation of role-based access controls.

RemediationAI

Immediately upgrade to patched versions: Discourse 2026.3.0-latest.1 or later, 2026.2.1 or later, or 2026.1.2 or later depending on the release series currently deployed. Follow the official Discourse upgrade documentation at https://github.com/discourse/discourse/security/advisories/GHSA-jj9p-p7m6-jq96. Since no workarounds are available, patching cannot be deferred. For organizations unable to patch immediately, implement strict role-based access control audits to identify and restrict moderator accounts to only their intended permissions, and monitor audit logs for unauthorized policy document modifications. Test patches in a staging environment before production deployment.

Affected VersionsENISA

discourse < 2026.3.0-latest.1
discourse 2026.2.0-latest, < 2026.2.1
discourse 2026.1.0-latest, < 2026.1.2

Affected Packages

euvd discourse fix: 2026.3.0-latest.1
euvd discourse_2026_1_0_latest fix: 2026.1.2
euvd discourse_2026_2_0_latest fix: 2026.2.1

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 3 packages in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Discourse is an open-source discussion platform built on Ruby on Rails. The vulnerability stems from improper privilege enforcement in the authorization layer, classified under CWE-269 (Improper Access Control / Privilege Issues). Specifically, the vulnerability allows moderators to bypass access control checks that should restrict modification of site policy documents to administrators only. This is an authorization bypass rather than an authentication bypass—authenticated moderators with elevated privileges can perform actions outside their intended scope due to insufficient server-side permission validation on policy document endpoints.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 2.2 LOW
AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

2
Patch available
Apr 16, 2026 - 05:29 EUVD
2026.3.0-latest.1,2026.2.1,2026.1.2
CVE Published
Mar 20, 2026 - 03:15 nvd
LOW 2.2

DescriptionGitHub Advisory

Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 allow a moderator to edit site policy documents (ToS, guidelines, privacy policy) that they are explicitly prohibited from modifying. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.

Executive ViewAI

Why It Matters

CVE-2026-30888 is a low-severity vulnerability in Discourse involving privilege management (CVSS 2.2). The limited severity suggests constrained impact, typically requiring specific conditions or local access for exploitation. Apply vendor updates when available as part of routine maintenance.

Business Impact: Low
Compensating Controls

Apply vendor patch during routine maintenance. Standard security controls provide adequate interim protection.

Threat Intelligence Overview

EPSS Score
0.0%
Top 94% exploitable
Data Quality
6 sources
Confidence: High

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity LOW
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
LOW severity (CVSS 0.1-3.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact
Low

Priority Score

11
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +11
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.

CVE-2025-48954 HIGH POC
8.1 Jun 25

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Discourse versions prior to 2025.12.2, 2026.1.1, and 2026.2.0 contain an insecure direct object reference (IDOR) in the

CVE-2021-3138 HIGH POC
7.5 Jan 14

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CVE-2026-26077 MEDIUM POC
6.5 Feb 26

Unauthenticated attackers can submit forged webhook payloads to multiple email provider integrations in Discourse versio

CVE-2023-38706 MEDIUM POC
6.5 Sep 15

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CVE-2024-53991 MEDIUM POC
5.9 Dec 19

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CVE-2025-48877 CRITICAL
9.8 Jun 09

Discourse versions prior to 3.4.4 (stable), 3.5.0.beta5 (beta), and 3.5.0.beta6-dev (tests-passed) contain a critical vu

CVE-2023-47121 CRITICAL
9.8 Nov 10

Discourse is an open source platform for community discussion. Rated critical severity (CVSS 9.8), this vulnerability is

CVE-2022-39355 CRITICAL
9.8 Oct 26

Discourse Patreon enables syncronization between Discourse Groups and Patreon rewards. Rated critical severity (CVSS 9.8

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