Is CVE-2024-53266 in the CISA KEV catalog?

No. CVE-2024-53266 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2024-53266?

CVE-2024-53266 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2024-53266?

CVE-2024-53266 has an EPSS score of 0.27% (18th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2024-53266?

Upgrade discourse to 3.3.3 or later.

CVE & CISA-KEV Catalog

CVE-2024-53266

MEDIUM

4.3

CVSS v3

NVD

Description

Discourse is an open source platform for community discussion. In affected versions with some combinations of plugins, and with CSP disabled, activity streams in the user's profile page may be vulnerable to XSS. This has been patched in the latest version of Discourse core. Users are advised to upgrade. Users unable to upgrade should ensure CSP is enabled.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

discourseNVD

Affected:< 3.3.3Fixed in:3.3.3CVE-2024-53266derived from NVD

Affected:< 3.4.0Fixed in:3.4.0CVE-2024-53266derived 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

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.27%probability of exploitation in 30 days

18thpercentile

Low risk: more likely to be exploited than 18% of all known CVEs.

References

Third-Party Advisory1

github.com

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

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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 2025-09-25.