What is the CVSS score of EUVD-2026-17552?

EUVD-2026-17552 has a CVSS 4.0 base score of 2.1 (Low). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N. EPSS exploitation probability: 0.0%.

Is there a patch available for EUVD-2026-17552?

Yes, a patch is available for EUVD-2026-17552. Update the affected software to the latest version immediately.

Discourse EUVD-2026-17552

| CVE-2026-32607 LOW

Cross-site Scripting (XSS) (CWE-79)

2026-03-31 GitHub_M

XSS Discourse

2.1

CVSS 4.0 · Vendor: GitHub_M

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Vulnerability Assessment

Weakness

CWE

CWE-79

OWASP Top 10:2025

A05:2025 - Injection

ASVS 5.0

V1 - Encoding and Sanitization Output encoding, context-aware escaping

MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Execution

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

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 31, 2026

Stored cross-site scripting (XSS) in Discourse assignment UI allows authenticated users with assign permission to inject arbitrary HTML/JavaScript into user and group display names when the hidden prioritize_full_name_in_ux site setting is enabled, affecting versions 2026.1.0–2026.1.2, 2026.2.0–2026.2.1, and 2026.3.0. The injected payload executes in the browser of any user viewing an affected topic, enabling session hijacking, credential theft, or malware distribution. No active exploitation confirmed; however, the requirement for console access to enable the vulnerable setting and assign permission to exploit limits real-world impact, though the low CVSS score (2.1) reflects these constraints rather than severity of XSS itself.

Affected VersionsENISA

discourse 2026.3.0-latest, < 2026.3.0

discourse 2026.2.0-latest, < 2026.2.2

discourse 2026.1.0-latest, < 2026.1.3

Affected Packages

euvd discourse_2026_1_0_latest fix: 2026.1.3

euvd discourse_2026_2_0_latest fix: 2026.2.2

euvd discourse_2026_3_0_latest fix: 2026.3.0

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.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (GitHub_M) PRIMARY 2.1 LOW

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (GitHub_M) · only source for this CVE.

CVSS VectorVendor: GitHub_M

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

Present

Privileges Required

Low

User Interaction

Passive

Vulnerable system: Confidentiality

Low

Vulnerable system: Integrity

Low

Vulnerable system: Availability

None

Subsequent system: Confidentiality

Low

Subsequent system: Integrity

Low

Subsequent system: Availability

None

Lifecycle Timeline

Patch available

Apr 16, 2026 - 05:29 EUVD

2026.3.0,2026.2.2,2026.1.3

CVE Published

Mar 31, 2026 - 17:40 nvd

LOW 2.1

DescriptionCVE.org

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, when the hidden prioritize_full_name_in_ux site setting is enabled (defaults to false, requires console access to change), user and group display names are rendered without HTML escaping in several assignment-related UI paths. This allows users with assign permission to inject arbitrary HTML/JavaScript that executes in the browser of any user viewing an affected topic. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.

Threat Intelligence Overview

EPSS Score

0.0%

Top 86% exploitable

Data Quality

6 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

Vulnrichment

GitHub

VulDB

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

None

System Exposure· derived

Open

Automatable

Human Impact· derived

Low

Technical Impact

Partial

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +10

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Cross-Site Scripting MEDIUM

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

More in Discourse

View all

CVE-2025-48954 HIGH Act Now POC

8.1 Jun 25

Discourse versions prior to 3.5.0.beta6 contain a reflected cross-site scripting (XSS) vulnerability in social login fun

CVE-2022-46162 CRITICAL Act Now POC

9.8 Nov 30

discourse-bbcode is the official BBCode plugin for Discourse. Rated critical severity (CVSS 9.8), this vulnerability is

CVE-2026-27934 HIGH This Week POC

8.7 Mar 19

Unauthorized information disclosure in Discourse discussion platform versions prior to 2026.3.0-latest.1, 2026.2.1, and

CVE-2024-47773 HIGH This Week POC

8.2 Oct 08

Discourse is an open source platform for community discussion. Rated high severity (CVSS 8.2), this vulnerability is rem

CVE-2026-26265 HIGH This Week POC

7.5 Feb 26

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 This Week POC

7.5 Jan 14

In Discourse 2.7.0 through beta1, a rate-limit bypass leads to a bypass of the 2FA requirement for certain forms. Rated

CVE-2026-26077 MEDIUM This Month POC

6.5 Feb 26

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

CVE-2023-38706 MEDIUM This Month POC

6.5 Sep 15

Discourse is an open-source discussion platform. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploi

CVE-2024-53991 MEDIUM This Month POC

5.9 Dec 19

Discourse is an open source platform for community discussion. Rated medium severity (CVSS 5.9), this vulnerability is r

CVE-2025-48877 CRITICAL Act Now

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 Act Now

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 Act Now

9.8 Oct 26

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

Same weakness CWE-79 – Cross-site Scripting (XSS)

View all

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CVE-2014-2120 MEDIUM

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CVE-2023-40000 HIGH POC

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CVE-2016-8581 MEDIUM POC

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CVE-2013-5223 MEDIUM POC

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CVE-2025-52367 MEDIUM POC

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Same technique XSS

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CVE-2017-9248 CRITICAL POC

9.8

CVE-2013-1710 CRITICAL POC

10.0

CVE-2024-52875 HIGH POC

8.8

References

Advisories & patches

ADVISORY https://vuldb.com/vuln/354473 REF https://github.com/discourse/discourse/commit/46edb174e237c6e57bda9c494160da0a174fe70d REF https://github.com/discourse/discourse/security/advisories/GHSA-xg68-q7ff-6gqm

Search Externally

GitHub PoC

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