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Fencer Vulns
medium 4.3

CVE-2024-4182 json

Mattermost crashes web clients via a malformed custom status

published 2024-04-26 2 y ago modified 2026-06-17 4 mo ago also GHSA-8f99-g2pj-x8w3 , GO-2024-2795 , EUVD-2024-1158

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 46%
public exploits
0
none known

Summary

Mattermost versions 9.6.0, 9.5.x before 9.5.3, 9.4.x before 9.4.5, and 8.1.x before 8.1.12 fail to handle JSON parsing errors in custom status values, which allows an authenticated attacker to crash other users' web clients via a malformed custom status.

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-2024-4182 updated cvss 4.3

mattermost: fail to handle JSON parsing errors in custom status values

  • 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

0.55% chance of exploitation in the next 30 days, higher than 46% 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 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
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
>=8.1.0, <8.1.12
>=9.4.0, <9.4.5
>=9.5.0, <9.5.3
>=9.6.0-rc1, <9.6.1
>=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
8.1.12
9.4.5
9.5.3
9.6.1
8.1.12+incompatible
9.4.5+incompatible
9.5.3+incompatible
9.6.1+incompatible

Affected products

  • Mattermost Mattermost

Classification

Weakness
  • CWE-754 Improper Check for Unusual or Exceptional Conditions

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.