CVE-2021-45471

In MediaWiki through 1.37, blocked IP addresses are allowed to edit EntitySchema items.

5.3 MediumFix available

In MediaWiki through 1.37, blocked IP addresses are allowed to edit EntitySchema items.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: Low
Availability: None

Exploit likelihood

1.25%Up 0.4 points since Dec 24, 2021

What each source reports

NVD Score used 5.3

In MediaWiki through 1.37, blocked IP addresses are allowed to edit EntitySchema items.

Record: CVE-2021-45471
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:P/A:N
Updated: 2026-11-02

CVE List No score

In MediaWiki through 1.37, blocked IP addresses are allowed to edit EntitySchema items.

Record: CVE-2021-45471
Updated: 2026-11-02

EUVDEUVD-2021-32237 No score

In MediaWiki through 1.37, blocked IP addresses are allowed to edit EntitySchema items.

Record: EUVD-2021-32237
Updated: 2026-11-03

GitHub AdvisoriesGHSA-mrv7-g7p3-qw62 No score

In MediaWiki through 1.37, blocked IP addresses are allowed to edit EntitySchema items.

In MediaWiki through 1.37, blocked IP addresses are allowed to edit EntitySchema items.

Record: GHSA-mrv7-g7p3-qw62
Updated: 2026-11-02

OSV 5.3

In MediaWiki through 1.37, blocked IP addresses are allowed to edit EntitySchema items.

Record: CVE-2021-45471
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-45471 5.3

In MediaWiki through 1.37, blocked IP addresses are allowed to edit EntitySchema items.

Record: UBUNTU-CVE-2021-45471
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-02

OSVBIT-mediawiki-2021-45471 No score

In MediaWiki through 1.37, blocked IP addresses are allowed to edit EntitySchema items.

Record: BIT-mediawiki-2021-45471
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`mediawiki` Bitnami	before 1.37.1	1.37.1
`mediawiki` Ubuntu:18.04:LTS	All versions, plus listed versions 1:1.27.3-11:1.27.4-11:1.27.4-21:1.27.4-3	None known
`mediawiki` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 1:1.31.2-1ubuntu11:1.31.5-11:1.31.5-1ubuntu11:1.31.5-21:1.31.5-3 Show 4 moreShow less 1:1.31.5-3ubuntu11:1.31.6-11:1.31.7-11:1.31.7-1ubuntu0.1~esm1	None known
`mediawiki` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 1:1.35.3-11:1.35.4-11:1.35.5-11:1.35.5-1ubuntu11:1.35.5-1ubuntu21:1.35.5-1ubuntu31:1.35.6-11:1.35.6-1ubuntu0.1~esm1	None known
`mediawiki` Ubuntu:Pro:24.04:LTS	All versions, plus listed versions 1:1.39.4-21:1.39.5-11:1.39.6-11:1.39.7-11:1.39.7-1ubuntu0.1~esm1	None known
`mediawiki` Ubuntu:25.10	All versions, plus listed versions 1:1.43.1+dfsg-11:1.43.1+dfsg-21:1.43.3+dfsg-1	None known
`mediawiki` Ubuntu:26.10	All versions, plus listed versions 1:1.43.8+dfsg-21:1.43.9+dfsg-11:1.43.9+dfsg-1ubuntu1	None known
`mediawiki` Ubuntu:26.04:LTS	All versions, plus listed versions 1:1.43.3+dfsg-11:1.43.5+dfsg-11:1.43.6+dfsg-21:1.43.8+dfsg-11:1.43.8+dfsg-2	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-45471 is a medium vulnerability (CVSS 5.3) in Mediawiki, published December 24, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.25%, the 69th percentile. Fixed in mediawiki 1.37.1.

Attack profile

How easy it is to exploit

What an attacker can affect

Exploit likelihood

What each source reports

Affected products

Affected packages

History

In short

References