CVE-2020-27839

Name: CVE-2020-27839
Creator: NVD / NIST
Published: 2021-05-26T22:15:07.863+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 2.45%

Last modified Jun 17, 2026

CVE-2020-27839 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. A flaw was found in ceph-dashboard. The JSON Web Token (JWT) used for user authentication is stored by the frontend application in the browser’s localStorage which is potentially vulnerable to attackers via XSS attacks. EPSS estimates a 2.45% chance of exploitation in the next 30 days.

Description

A flaw was found in ceph-dashboard. The JSON Web Token (JWT) used for user authentication is stored by the frontend application in the browser’s localStorage which is potentially vulnerable to attackers via XSS attacks. The highest threat from this vulnerability is to data confidentiality and integrity.

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

2.45%

82.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-522

Affected Software

Vendor	Product	Versions
Redhat	Ceph	< 14.2.17
Redhat	Ceph	>= 15.2.0, < 15.2.9

References

https://bugzilla.redhat.com/show_bug.cgi?id=1901330Issue Tracking, Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1901330Issue Tracking, Vendor Advisory

Timeline

Published: May 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-27839?

How severe is CVE-2020-27839?

CVE-2020-27839 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 2.45% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27839?

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-2020-27839?

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

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Source: NVD / NIST