CVE-2020-21345

Name: CVE-2020-21345
Creator: NVD / NIST
Published: 2021-05-20T17:15:07.517+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.81%

Last modified Jun 17, 2026

CVE-2020-21345 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Cross Site Scripting (XSS) vulnerability in Halo 1.1.3 via post publish components in the manage panel, which lets a remote malicious user execute arbitrary code.. EPSS estimates a 0.81% chance of exploitation in the next 30 days.

Description

Cross Site Scripting (XSS) vulnerability in Halo 1.1.3 via post publish components in the manage panel, which lets a remote malicious user execute arbitrary code.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.81%

52.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Halo	Halo	1.1.3

References

https://github.com/halo-dev/halo/issues/336Exploit, Issue Tracking, Third Party Advisory
https://github.com/halo-dev/halo/issues/336Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: May 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-21345?

Cross Site Scripting (XSS) vulnerability in Halo 1.1.3 via post publish components in the manage panel, which lets a remote malicious user execute arbitrary code.

How severe is CVE-2020-21345?

CVE-2020-21345 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.81% probability of exploitation in the next 30 days.

How do I fix CVE-2020-21345?

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-2020-21345?

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

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Source: NVD / NIST