Is CVE-2020-26870 in the CISA KEV catalog?

No. CVE-2020-26870 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-26870?

CVE-2020-26870 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2020-26870?

CVE-2020-26870 has an EPSS score of 4.88% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-26870?

Upgrade application express to 21.1.0.00.01 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2020-26870

MEDIUMEPSS 91th pctl

6.1

CVSS v3

NVD

Description

Cure53 DOMPurify before 2.0.17 allows mutation XSS. This occurs because a serialize-parse roundtrip does not necessarily return the original DOM tree, and a namespace can change from HTML to MathML, as demonstrated by nesting of FORM elements.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

application expressNVD

Affected:< 21.1.0.00.01Fixed in:21.1.0.00.01CVE-2020-26870derived from NVD

dompurifyNVD

Affected:< 2.0.17Fixed in:2.0.17CVE-2020-26870derived 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 RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

4.88%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Patch4

Exploit1

research.securitum.com

Third-Party Advisory1

lists.debian.org

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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HTML

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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.