CVE-2019-17673

WordPress before 5.2.4 is vulnerable to poisoning of the cache of JSON GET requests because...

7.5 HighFix available

WordPress before 5.2.4 is vulnerable to poisoning of the cache of JSON GET requests because certain requests lack a Vary: Origin header.

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: High
Availability: None

Exploit likelihood

3.53%Up 1.7 points since Apr 14, 2021

What each source reports

NVD Score used 7.5

WordPress before 5.2.4 is vulnerable to poisoning of the cache of JSON GET requests because certain requests lack a Vary: Origin header.

Record: CVE-2019-17673
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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

WordPress before 5.2.4 is vulnerable to poisoning of the cache of JSON GET requests because certain requests lack a Vary: Origin header.

Record: CVE-2019-17673
Updated: 2026-11-02

EUVDEUVD-2019-7978 No score

WordPress before 5.2.4 is vulnerable to poisoning of the cache of JSON GET requests because certain requests lack a Vary: Origin header.

Record: EUVD-2019-7978
Updated: 2026-11-03

GitHub AdvisoriesGHSA-93gm-xcwj-q3j2 7.5

WordPress before 5.2.4 is vulnerable to poisoning of the cache of JSON GET requests because...

WordPress before 5.2.4 is vulnerable to poisoning of the cache of JSON GET requests because certain requests lack a Vary: Origin header.

Record: GHSA-93gm-xcwj-q3j2
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness: CWE-20
Updated: 2026-11-02

OSV 7.5

WordPress before 5.2.4 is vulnerable to poisoning of the cache of JSON GET requests because certain requests lack a Vary: Origin header.

Record: CVE-2019-17673
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated: 2026-11-02

OSVDEBIAN-CVE-2019-17673 7.5

WordPress before 5.2.4 is vulnerable to poisoning of the cache of JSON GET requests because certain requests lack a Vary: Origin header.

Record: DEBIAN-CVE-2019-17673
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2019-17673 7.5

WordPress before 5.2.4 is vulnerable to poisoning of the cache of JSON GET requests because certain requests lack a Vary: Origin header.

Record: UBUNTU-CVE-2019-17673
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`wordpress` Debian:12	before 5.2.4+dfsg1-1	5.2.4+dfsg1-1
`wordpress` Debian:13	before 5.2.4+dfsg1-1	5.2.4+dfsg1-1
`wordpress` Debian:14	before 5.2.4+dfsg1-1	5.2.4+dfsg1-1
`wordpress` Debian:10 From an advisory covering 18 CVEs	before 5.0.4+dfsg1-1+deb10u1, plus listed versions 5.0.4+dfsg1-1	5.0.4+dfsg1-1+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

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-2019-17673 is a high vulnerability (CVSS 7.5) in Wordpress, published October 17, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.53%, the 89th percentile. Fixed in wordpress 5.2.4+dfsg1-1.

References

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