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CVE-2021-44223

WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for...

8.1 HighFix available

WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

29.0%Up 27.6 points since Nov 26, 2021
90%50%10%1%

What each source reports

CVE List Score used 8.1

WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.

Record
CVE-2021-44223
CVSS 3.1
8.1 HighCVSS:3.1/AC:H/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N
Updated
2026-11-02
EUVDEUVD-2021-31072 8.1

WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.

Record
EUVD-2021-31072
CVSS 3.1
8.1 HighCVSS:3.1/AC:H/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-m8cv-g4gv-cx2g No score

WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for...

WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.

Record
GHSA-m8cv-g4gv-cx2g
Updated
2026-11-02
NVD 8.1

WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.

Record
CVE-2021-44223
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Updated
2026-11-02
OSV 9.8

WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.

Record
CVE-2021-44223
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2021-44223 9.8

WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.

Record
DEBIAN-CVE-2021-44223
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-44223 8.1

WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.

Record
UBUNTU-CVE-2021-44223
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVBIT-wordpress-2021-44223 No score

WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.

Record
BIT-wordpress-2021-44223
Updated
2026-11-02
OSVBIT-wordpress-multisite-2021-44223 No score

WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.

Record
BIT-wordpress-multisite-2021-44223
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
wordpress
Bitnami
 before 5.8.0
5.8.0
wordpress-multisite
Bitnami
 before 5.8.0
5.8.0
wordpress
Debian:12
 before 5.8.1+dfsg1-1
5.8.1+dfsg1-1
wordpress
Debian:13
 before 5.8.1+dfsg1-1
5.8.1+dfsg1-1
wordpress
Debian:14
 before 5.8.1+dfsg1-1
5.8.1+dfsg1-1
wordpress
Ubuntu:16.04:LTS
 All versions, plus listed versions
4.3+dfsg-14.3.1+dfsg-14.4+dfsg-14.4.1+dfsg-14.4.2+dfsg-14.4.2+dfsg-1ubuntu1
 None known
wordpress
Ubuntu:18.04:LTS
 All versions, plus listed versions
4.8.2+dfsg-24.8.3+dfsg-14.9.1+dfsg-14.9.2+dfsg-14.9.4+dfsg-14.9.5+dfsg1-1
 None known
wordpress
Ubuntu:20.04:LTS
 All versions, plus listed versions
5.2.2+dfsg1-15.2.4+dfsg1-15.3.2+dfsg1-15.3.2+dfsg1-1ubuntu1
 None known

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2021-44223 is a high vulnerability (CVSS 8.1) in Wordpress, published November 25, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 29.0%, the 98th percentile. Fixed in wordpress 5.8.0.

References

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