How severe is CVE-2020-27839?

CVE-2020-27839 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-27839 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-27839?

CVE-2020-27839 affects Redhat Ceph. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-27839?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-27839 published?

CVE-2020-27839 was published on 2021-05-26 and last updated on 2026-06-17.

CVE-2020-27839

CVE-2020-27839 is a medium-severity vulnerability in Redhat Ceph with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-522.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-522
Affected product: Redhat Ceph
Published: 2021-05-26
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-27839?: 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.
How severe is CVE-2020-27839?: CVE-2020-27839 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-27839 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-27839?: CVE-2020-27839 affects Redhat Ceph. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-27839?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-27839 published?: CVE-2020-27839 was published on 2021-05-26 and last updated on 2026-06-17.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1901330

Affected products (1)

cpe:2.3:a:redhat:ceph:*:*:*:*:*:*:*:*

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