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Fencer Intel
high 7.5

CVE-2017-18917 json

Mattermost Server uses weak hashing for OAuth, email verification tokens and invitations

published 2020-06-19 6 y ago modified 2026-06-17 4 mo ago also GHSA-jxc4-w54c-qv5r , GO-2026-4463 , EUVD-2017-10007

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. Weak hashing was used for e-mail invitations, OAuth, and e-mail verification tokens.

Patch / fix

  • go github.com/mattermost/mattermost-server 3.7.5-0.20170421192444-247cd1e51a8c, 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

0.72% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected packages

ecosystem package affected fixed in
go github.com/mattermost/mattermost-server
<3.7.5-0.20170421192444-247cd1e51a8c
>=3.8.0, <3.8.2
>=3.8.0+incompatible, <3.8.2+incompatible
3.7.5-0.20170421192444-247cd1e51a8c
3.8.2
3.8.2+incompatible

Classification

Weakness
  • CWE-916 Use of Password Hash With Insufficient Computational Effort
  • CWE-328 Use of Weak Hash

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.