OpenID Connect Generic Client 3.8.0-3.8.1 - Reflected Cross Site Scripting (XSS) via Login Error

published 2021-05-05 5y ago modified 2026-06-17 4mo ago also EUVD-2021-11128

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.6%; EPSS 1.6% chance of exploitation in 30 days, percentile 76%
public exploits: 0; none known, plus a Nuclei check

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.

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Exploit prediction

1.62% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

Nuclei template WordPress OpenID Connect Generic Client 3.8.0-3.8.1 - Cross-Site Scripting nuclei detection template
wpscan.com https://wpscan.com/vulnerability/31cf0dfb-4025-4898-a5f4-fc7115565a10 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

daggerhart OpenID Connect Generic Client

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

Technology feeds

WordPress rss critical rss

References

wpscan.com /vulnerability/31cf0dfb-4025-4898-a5f4-fc7115565a10
exploit, third-party-advisory

Sources

CVE List CVE-2021-24214
NVD CVE-2021-24214

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