9.8

CVE-2018-21251: mattermost mattermost_server Missing Authorization

CVSS: 9.8v3.1CriticalModified
Published 19-06-2020Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2018-21251 is a critical (CVSS 9.8) Missing Authorization vulnerability in mattermost mattermost_server. EPSS estimates a 1.20% chance of exploitation in the next 30 days, higher than 67.6% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
1.20%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 19-06-2020
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

An issue was discovered in Mattermost Server before 5.2 and 5.1.1. Authorization could be bypassed if the channel name were not the same in the params and the body.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

1.20%

Chance of exploitation in the next 30 days

Percentile

68%

Versus all other CVEs

30-day change

0.00 pp

From 1.20% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.20%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Mattermost1 product
  • mattermost_server< 5.1.1 | 5.2.0:rc1 | 5.2.0:rc2 | 5.2.0:rc3 | 5.2.0:rc4 | 5.2.0:rc5 | 5.2.0:rc6

1 vendor · 1 product

References

1 links