Is CVE-2026-33300 in the CISA KEV catalog?

No. CVE-2026-33300 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-33300?

CVE-2026-33300 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2026-33300?

CVE-2026-33300 has an EPSS score of 0.23% (14th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-33300?

Upgrade discourse to 2026.2.2 or later.

CVE & CISA-KEV Catalog

CVE-2026-33300

MEDIUM

6.5

CVSS v3

NVD

Description

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, an authorization bypass in the Category Chatables Controller show action allowed moderators to get information on hidden groups names and user count. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.

CWE-200Information Exposure

How to fix

Remediation Available

discourseNVD

Affected:>= 2026.2.0, < 2026.2.2Fixed in:2026.2.2CVE-2026-33300derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

0.23%probability of exploitation in 30 days

14thpercentile

Low risk: more likely to be exploited than 14% of all known CVEs.

References

Patch1

github.com

Vendor Advisory1

github.com

Related Vulnerabilities

Other CWE-200 (Information Exposure) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-24919	High	8.6	100%	KEV + Ransom	-
CVE-2020-14181	Medium	5.3	100%	-	Fix
CVE-2021-34429	Medium	5.3	99%	-	Fix
CVE-2018-11409	Medium	5.3	98%	-	-
CVE-2021-41277	Critical	10.0	97%	KEV	-
CVE-2016-2183	High	7.5	96%	-	Fix

Embed a live status badge for CVE-2026-33300

Markdown

[![CVE-2026-33300](https://tridentstack.com/cve/badge/CVE-2026-33300.svg)](https://tridentstack.com/cve/CVE-2026-33300)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-33300"><img src="https://tridentstack.com/cve/badge/CVE-2026-33300.svg" alt="CVE-2026-33300"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-09.