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Fencer Intel
critical 9.8

CVE-2017-18915 json

Mattermost Server server restarts may provide attackers with API access

published 2020-06-19 6 y ago modified 2026-06-17 4 mo ago also GHSA-hxxj-8phw-74vw , GO-2026-4462 , EUVD-2017-10005

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits
0
none known

Summary

An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. After a restart of a server, an attacker might suddenly gain API Endpoint access.

Patch / fix

  • go github.com/mattermost/mattermost-server 3.6.7-0.20170420152529-0968e4079e0a, 3.7.5, 3.7.5+incompatible, 3.8.2, 3.8.2+incompatible
  • mattermost mattermost_server 3.6.7, 3.7.5, 3.8.2
  • govulncheck-vulndb openSUSE Leap 15.6 0.0.20260226T182644-150000.1.149.1

suse advisories SUSE-SU-2026:0757-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

Exploit prediction

1.18% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
go github.com/mattermost/mattermost-server
<3.6.7-0.20170420152529-0968e4079e0a
>=3.7.0, <3.7.5
>=3.8.0, <3.8.2
>=3.7.0+incompatible, <3.7.5+incompatible
>=3.8.0+incompatible, <3.8.2+incompatible
3.6.7-0.20170420152529-0968e4079e0a
3.7.5
3.8.2
3.7.5+incompatible
3.8.2+incompatible

Classification

Weakness
  • CWE-276 Incorrect Default Permissions
  • CWE-20 Improper Input Validation
  • CWE-807 Reliance on Untrusted Inputs in a Security Decision

References

Sources

Fencer Intel 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.