4.3

CVE-2023-50333: Lack of restriction to manage group names for freshly demoted guests

Modified
AliasesGHSA-9w97-9rqx-8v4jBIT-mattermost-2023-50333GO-2024-2444
Published 02-01-2024Last modified 17-06-2025

Vulnerability summary

CVE-2023-50333 is a medium (CVSS 4.3) Improper Access Control vulnerability in mattermost. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 25% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 3.7, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
4.3/10
010
Medium · v3.1 (NVD)
EPSS score
0.32%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 7
CGA-28FJ-7RMV-XW55CGA-7Q4C-CQWG-26GHCGA-CRFQ-MCJP-VJ2HCGA-QFRR-CFQV-WX3PCGA-QVF5-89G9-XRRWCGA-WCFM-5G6H-5Q26

Timeline

  1. 02-01-2024
    PublishedVulnerability first disclosed.
  2. 17-06-2025
    Last modifiedVulnerability information updated.

Description

Mattermost fails to update the permissions of the current session for a user who was just demoted to guest, allowing freshly demoted guests to change group names.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.32%

Chance of exploitation in the next 30 days

Percentile

25%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.32% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, low-privilege account, user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard2 products
  • mattermost-fips-10.5All versions (No fix recorded)
  • mattermost-fips-10.5-compatAll versions (No fix recorded)
Github.com/mattermost/mattermost-server2 products
  • v5All versions (No fix recorded)
  • v6All versions (No fix recorded)
Mattermost2 products
Github.com/mattermost1 product
  • mattermost-serverAll versions (No fix recorded)
Github.com/mattermost/mattermost/server1 product
  • v8< 8.1.7 | All versions (No fix recorded)

5 vendors · 8 products

References

6 links