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Fencer Vulns
medium 4.3

CVE-2024-4183 json

Mattermost fails to limit the number of active sessions

published 2024-04-26 2 y ago modified 2026-06-17 4 mo ago also GHSA-wj37-mpq9-xrcm , GO-2024-2798 , EUVD-2024-1321

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

Mattermost versions 8.1.x before 8.1.12, 9.6.x before 9.6.1, 9.5.x before 9.5.3, 9.4.x before 9.4.5 fail to limit the number of active sessions, which allows an authenticated attacker to crash the server via repeated requests to the getSessions API after flooding the sessions table.

Patch / fix

  • go github.com/mattermost/mattermost-server 8.1.12, 8.1.12+incompatible, 9.4.5, 9.4.5+incompatible, 9.5.3, 9.5.3+incompatible, 9.6.1, 9.6.1+incompatible
  • Mattermost Mattermost 8.1.12, 9.4.5, 9.5.3, 9.6.1, 9.7.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-4183 updated cvss 4.3

mattermost: fail to limit the number of active sessions

  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/acm-grafana-rhel8 Red Hat Advanced Cluster Security 3 advanced-cluster-security/rhacs-docs-rhel8, advanced-cluster-security/rhacs-main-rhel8, advanced-cluster-security/rhacs-roxctl-rhel8, advanced-cluster-security/rhacs-scanner-rhel8, advanced-cluster-security/rhacs-rhel8-operator, advanced-cluster-security/rhacs-scanner-db-rhel8
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift Container Platform 4 openshift4/ose-grafana
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
go github.com/mattermost/mattermost-server
>=9.6.0-rc1, <9.6.1
>=9.5.0, <9.5.3
>=9.4.0, <9.4.5
>=8.1.0, <8.1.12
>=8.1.0+incompatible, <8.1.12+incompatible
>=9.4.0+incompatible, <9.4.5+incompatible
>=9.5.0+incompatible, <9.5.3+incompatible
>=9.6.0-rc1+incompatible, <9.6.1+incompatible
9.6.1
9.5.3
9.4.5
8.1.12
8.1.12+incompatible
9.4.5+incompatible
9.5.3+incompatible
9.6.1+incompatible

Affected products

  • Mattermost Mattermost

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.