CVE-2021-27559

Name: CVE-2021-27559
Creator: NVD / NIST
Published: 2021-02-22T15:15:13.227+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.59%

Last modified Jun 17, 2026

CVE-2021-27559 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. The Contact page in Monica 2.19.1 allows stored XSS via the Nickname field.. EPSS estimates a 0.59% chance of exploitation in the next 30 days.

Description

The Contact page in Monica 2.19.1 allows stored XSS via the Nickname field.

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.59%

43.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Monicahq	Monica	2.19.1

References

https://github.com/monicahq/monica/issues/4888Issue Tracking, Third Party Advisory
https://github.com/monicahq/monica/pull/4543Exploit, Third Party Advisory
https://github.com/monicahq/monica/issues/4888Issue Tracking, Third Party Advisory
https://github.com/monicahq/monica/pull/4543Exploit, Third Party Advisory

Timeline

Published: Feb 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27559?

The Contact page in Monica 2.19.1 allows stored XSS via the Nickname field.

How severe is CVE-2021-27559?

CVE-2021-27559 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.59% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27559?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-27559?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST