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Vulnerability record · CVE-2021-3509 · published 27 May 2021

CVE-2021-3509: Redhat ceph storage cross-site scripting vulnerability

Redhat · Ceph Storage

A flaw was found in Red Hat Ceph Storage 4, in the Dashboard component. In response to CVE-2020-27839, the JWT token was moved from localStorage to an httpOnly cookie. However, token cookies are used in the body of the HTTP response for the documentation, which again makes it available to XSS.The greatest threat to the system is for confidentiality, integrity, and availability.

6.1 CVSS 3.1 Medium EPSS 1.7% · top 23.7% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score, v2 4.3
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A flaw was found in Red Hat Ceph Storage 4, in the Dashboard component. In response to CVE-2020-27839, the JWT token was moved from localStorage to an httpOnly cookie. However, token cookies are used in the body of the HTTP response for the documentation, which again makes it available to XSS.The greatest threat to the system is for confidentiality, integrity, and availability.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1950116 Issue TrackingPatchVendor Advisory
https://github.com/ceph/ceph/blob/f1557e8f62d31883d3d34ae241a1a26af11d923f/src/pybind/mgr/dashboard/controllers/docs.py# ExploitThird Party Advisory
https://github.com/ceph/ceph/commit/7a1ca8d372da3b6a4fc3d221a0e5f72d1d61c27b PatchThird Party Advisory
https://github.com/ceph/ceph/commit/adda853e64bdba1288d46bc7d462d23d8f2f10ca PatchThird Party Advisory
https://github.com/ceph/ceph/commit/af3fffab3b0f13057134d96e5d481e400d8bfd27 PatchThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1950116 Issue TrackingPatchVendor Advisory
https://github.com/ceph/ceph/blob/f1557e8f62d31883d3d34ae241a1a26af11d923f/src/pybind/mgr/dashboard/controllers/docs.py# ExploitThird Party Advisory
https://github.com/ceph/ceph/commit/7a1ca8d372da3b6a4fc3d221a0e5f72d1d61c27b PatchThird Party Advisory
https://github.com/ceph/ceph/commit/adda853e64bdba1288d46bc7d462d23d8f2f10ca PatchThird Party Advisory
https://github.com/ceph/ceph/commit/af3fffab3b0f13057134d96e5d481e400d8bfd27 PatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-3509), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.