What is CVE-2021-25091?

CVE-2021-25091 is a medium-severity vulnerability in Ylefebvre Link Library, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-02-01.

How severe is CVE-2021-25091?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-25091 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Ylefebvre Link Library

CVE-2021-25091

The Link Library WordPress plugin before 7.2.9 does not sanitise and escape the settingscopy parameter before outputting it back in an admin page, leading to a Reflected Cross-Site Scripting

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-02-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (54.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Ylefebvre Link Library
Link Library — versions 7.2.9

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

20142995/nuclei-templates

References

wpscan.com/vulnerability/96204946-0b10-4a2c-8079-473883ff95b6 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-25091?: CVE-2021-25091 is a medium-severity vulnerability in Ylefebvre Link Library, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-02-01.
How severe is CVE-2021-25091?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-25091 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.