CVE-2021-24214: The OpenID Connect Generic Client WordPress plugin 3.8.0 and 3.8.1 did not sanitise the login error when outpu

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MEDIUM 6.1DOWNGRADE

CVE-2021-24214 is a medium-severity flaw (CVSS 6.1) affecting openid connect generic client. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The OpenID Connect Generic Client WordPress plugin 3.8.0 and 3.8.1 did not sanitise the login error when output back in the login form, leading to a reflected Cross-Site Scripting issue. This issue does not require authentication and can be exploited with the default configuration.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-05-06
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: daggerhartlab

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-05-06 13:15 UTCPublished CVE record published
2026-06-17 03:39 UTCUpdated Record last modified

daggerhartlab openid connect generic client DOWNGRADE

Affected: 3.8.0 · 3.8.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.8.0

1. Check installed version

apt-cache policy openid-connect-generic-client || rpm -q openid-connect-generic-client || openid-connect-generic-client --version

2. No fixed release: DOWNGRADE to a release before 3.8.0 (Debian / Ubuntu)

apt-cache madison openid-connect-generic-client sudo apt install openid-connect-generic-client=<VERSION_BEFORE_3.8.0> sudo apt-mark hold openid-connect-generic-client

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list openid-connect-generic-client sudo dnf downgrade openid-connect-generic-client-<VERSION_BEFORE_3.8.0> sudo dnf versionlock add openid-connect-generic-client

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: WordPress OpenID Connect Generic Client 3.8.0-3.8.1 - Cross-Site Scripting

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-24214?

openid connect generic client: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-24214 being exploited?

CVE-2021-24214 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-24214 affect?

CVE-2021-24214 affects openid connect generic client. Severity is medium (CVSS 6.1). The OpenID Connect Generic Client WordPress plugin 3.8.0 and 3.8.1 did not sanitise the login error when output back in the login form, leading to a reflected Cross-Site Scripting issue. This issue does not require authentication and can be

How urgent is CVE-2021-24214?

Priority 45/100. Public exploit reference

Software pages

WordPress vulnerabilities

References

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