01 Record

CVE-2021-39164

Improper authorisation of /members discloses room membership to non-members

LowPUBLISHEDCNA: GitHub_M

CNA base score3.1 CVSS v3.xCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

View raw JSON

02 Description

Improper authorisation of /members discloses room membership to non-members

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 1.46% probability of exploitation activity in the next 30 days.
EPSS percentile: Ranks above 71.7% of scored records. A rank, not a probability.
NVD base score: 3.1 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
NVD analysis status: Modified. NVD last modified this record on 2026-06-17.
Red Hat severity: No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2021-08-31 16:20Z5 YR AGO

Last updated

2024-08-04 01:58Z2 YR AGO

Reserved

2021-08-16

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Low (CVSS 3.1)

CNA CVSS vector

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

Weaknesses

CWE-200Exposure of Sensitive Information to an Unauthorized ActorClass
CWE-863Incorrect AuthorizationClass

Data version

5.1

Document digest

54aaf1d4514def43391e369796036eaac254c761764966b2b7235dfc779ec4bb

05 Affected products

VendorProductVersionsPlatforms

matrix-orgsynapse< 1.41.1—

06 References

github.comhttps://github.com/matrix-org/synapse/commit/cb35df940ax_refsource_MISC
github.comhttps://github.com/matrix-org/synapse/releases/tag/v1.41.1x_refsource_MISC
github.comhttps://github.com/matrix-org/synapse/security/advisories/GHSA-3x4c-pq33-4w3qx_refsource_CONFIRM
lists.fedoraproject.orgFEDORA-2021-2e8ed15b14https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PXT7ID7DNBRN2TVTETU3SYQHJKEG6PXN/vendor-advisoryx_refsource_FEDORA
lists.fedoraproject.orgFEDORA-2021-f12fdca1bfhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2VHDEPCZ22GJFMZCWA2XZAGPOEV72POF/vendor-advisoryx_refsource_FEDORA

01 Record index

CVE-2021-39164

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2021-39164

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References