Is CVE-2021-39136 in the CISA KEV catalog?

No. CVE-2021-39136 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-39136?

CVE-2021-39136 has a CVSS v3 base score of 8.7 (HIGH).

What is the EPSS score for CVE-2021-39136?

CVE-2021-39136 has an EPSS score of 0.93% (56th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-39136?

Upgrade basercms to 4.5.1 or later.

CVE & CISA-KEV Catalog

CVE-2021-39136

HIGH

8.7

CVSS v3

NVD

Description

baserCMS is an open source content management system with a focus on Japanese language support. In affected versions there is a cross-site scripting vulnerability in the file upload function of the management system of baserCMS. Users are advised to update as soon as possible. No workaround are available to mitigate this issue.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

basercmsNVD

Affected:< 4.5.1Fixed in:4.5.1CVE-2021-39136derived 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 InteractionRequired

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.93%probability of exploitation in 30 days

56thpercentile

Moderate risk: more likely to be exploited than 56% of all known CVEs.

References

Patch1

github.com

Vendor Advisory1

basercms.net

Third-Party Advisory2

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 2024-11-21.