Is CVE-2020-26121 in the CISA KEV catalog?

No. CVE-2020-26121 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-26121?

CVE-2020-26121 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-26121?

CVE-2020-26121 has an EPSS score of 1.28% (66th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-26121?

Upgrade mediawiki to 1.34.4 or later.

CVE & CISA-KEV Catalog

CVE-2020-26121

HIGH

7.5

CVSS v3

NVD

Description

An issue was discovered in the FileImporter extension for MediaWiki before 1.34.4. An attacker can import a file even when the target page is protected against "page creation" and the attacker should not be able to create it. This occurs because of a mishandled distinction between an upload restriction and a create restriction. An attacker cannot leverage this to overwrite anything, but can leverage this to force a wiki to have a page with a disallowed title.

CWE-863Incorrect Authorization

How to fix

Remediation Available

mediawikiNVD

Affected:< 1.34.4Fixed in:1.34.4CVE-2020-26121derived 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 InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

1.28%probability of exploitation in 30 days

66thpercentile

Moderate risk: more likely to be exploited than 66% of all known CVEs.

References

Patch2

Vendor Advisory1

commons.wikimedia.org

Other references1

lists.fedoraproject.org

Related Vulnerabilities

Other CWE-863 (Incorrect Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-22518	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-38035	Critical	9.8	100%	KEV + Ransom	-
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2025-29927	Critical	9.1	100%	-	Fix
CVE-2024-38856	Critical	9.8	99%	KEV	Fix
CVE-2020-36289	Medium	5.3	99%	-	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.