CVE-2020-28036

wp-includes/class-wp-xmlrpc-server.php in WordPress before 5.5.2 allows attackers to gain...

9.8 CriticalFix available

wp-includes/class-wp-xmlrpc-server.php in WordPress before 5.5.2 allows attackers to gain privileges by using XML-RPC to comment on a post.

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: High
Integrity: High
Availability: High

Exploit likelihood

5.22%Up 3.4 points since Apr 14, 2021

What each source reports

NVD Score used 9.8

wp-includes/class-wp-xmlrpc-server.php in WordPress before 5.5.2 allows attackers to gain privileges by using XML-RPC to comment on a post.

Record: CVE-2020-28036
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
Weakness: CWE-862
Updated: 2026-11-02

CVE List No score

wp-includes/class-wp-xmlrpc-server.php in WordPress before 5.5.2 allows attackers to gain privileges by using XML-RPC to comment on a post.

Record: CVE-2020-28036
Updated: 2026-11-02

EUVDEUVD-2020-20527 No score

wp-includes/class-wp-xmlrpc-server.php in WordPress before 5.5.2 allows attackers to gain privileges by using XML-RPC to comment on a post.

Record: EUVD-2020-20527
Updated: 2026-11-03

GitHub AdvisoriesGHSA-mc26-rfqj-pwxf 9.8

wp-includes/class-wp-xmlrpc-server.php in WordPress before 5.5.2 allows attackers to gain...

wp-includes/class-wp-xmlrpc-server.php in WordPress before 5.5.2 allows attackers to gain privileges by using XML-RPC to comment on a post.

Record: GHSA-mc26-rfqj-pwxf
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-269, CWE-862
Updated: 2026-11-02

OSV 9.8

wp-includes/class-wp-xmlrpc-server.php in WordPress before 5.5.2 allows attackers to gain privileges by using XML-RPC to comment on a post.

Record: CVE-2020-28036
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-2020-28036 9.8

wp-includes/class-wp-xmlrpc-server.php in WordPress before 5.5.2 allows attackers to gain privileges by using XML-RPC to comment on a post.

Record: DEBIAN-CVE-2020-28036
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-2020-28036 9.8

wp-includes/class-wp-xmlrpc-server.php in WordPress before 5.5.2 allows attackers to gain privileges by using XML-RPC to comment on a post.

Record: UBUNTU-CVE-2020-28036
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-2020-28036 No score

wp-includes/class-wp-xmlrpc-server.php in WordPress before 5.5.2 allows attackers to gain privileges by using XML-RPC to comment on a post.

Record: BIT-wordpress-2020-28036
Updated: 2026-11-02

OSVBIT-wordpress-multisite-2020-28036 No score

wp-includes/class-wp-xmlrpc-server.php in WordPress before 5.5.2 allows attackers to gain privileges by using XML-RPC to comment on a post.

Record: BIT-wordpress-multisite-2020-28036
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`wordpress` Bitnami	before 5.5.2	5.5.2
`wordpress-multisite` Bitnami	before 5.5.2	5.5.2
`wordpress` Debian:12	before 5.5.3+dfsg1-1	5.5.3+dfsg1-1
`wordpress` Debian:13	before 5.5.3+dfsg1-1	5.5.3+dfsg1-1
`wordpress` Debian:14	before 5.5.3+dfsg1-1	5.5.3+dfsg1-1
`wordpress` Debian:9 From an advisory covering 9 CVEs	before 4.7.19+dfsg-1+deb9u1, plus listed versions 4.7.18+dfsg-1+deb9u14.7.5+dfsg-24.7.5+dfsg-2+deb9u14.7.5+dfsg-2+deb9u1~bpo8+14.7.5+dfsg-2+deb9u2 Show 5 moreShow less 4.7.5+dfsg-2+deb9u2~bpo8+14.7.5+dfsg-2+deb9u34.7.5+dfsg-2+deb9u44.7.5+dfsg-2+deb9u54.7.5+dfsg-2+deb9u6	4.7.19+dfsg-1+deb9u1
`wordpress` Debian:10 From an advisory covering 9 CVEs	before 5.0.11+dfsg1-0+deb10u1, plus listed versions 5.0.10+dfsg1-0+deb10u15.0.4+dfsg1-15.0.4+dfsg1-1+deb10u15.0.4+dfsg1-1+deb10u2	5.0.11+dfsg1-0+deb10u1
`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

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Affected packages
Package	Affected	Fixed
`wordpress` Ubuntu:22.04:LTS	All versions, plus listed versions 5.7.1+dfsg1-2ubuntu15.8.1+dfsg1-2ubuntu15.8.2+dfsg1-1ubuntu15.8.3+dfsg1-1ubuntu15.8.3+dfsg1-1ubuntu1.1	None known
`wordpress` Ubuntu:24.04:LTS	All versions, plus listed versions 6.2+dfsg1-1ubuntu16.4.3+dfsg1-1ubuntu1	None known
`wordpress` Ubuntu:25.10	All versions, plus listed versions 6.7.2+dfsg1-1.1ubuntu1	None known
`wordpress` Ubuntu:26.10	All versions, plus listed versions 6.7.2+dfsg1-1.1ubuntu2	None known
`wordpress` Ubuntu:26.04:LTS	All versions, plus listed versions 6.7.2+dfsg1-1.1ubuntu16.7.2+dfsg1-1.1ubuntu2	None known

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
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-2020-28036 is a critical vulnerability (CVSS 9.8) in Wordpress, published October 31, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 5.22%, the 92nd percentile. Fixed in wordpress 5.5.2.

References

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