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Fencer Intel
medium 5.3

CVE-2016-11076 json

Mattermost Server does not check if cookies are used over SSL

published 2020-06-19 6 y ago modified 2026-06-17 4 mo ago also GHSA-379p-37xc-q963 , GO-2025-4054 , EUVD-2016-2065

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits
0
none known

Summary

An issue was discovered in Mattermost Server before 3.0.0. It does not ensure that a cookie is used over SSL.

Patch / fix

  • go github.com/mattermost/mattermost-server 3.0.0, 3.0.0+incompatible
  • mattermost mattermost_server 3.0.0
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • govulncheck-vulndb openSUSE Tumbleweed 0.0.20251105T184115-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2025:15710-1

Exploit prediction

0.88% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
go github.com/mattermost/mattermost-server
<3.0.0
<3.0.0+incompatible
3.0.0
3.0.0+incompatible

Classification

Weakness
  • CWE-295 Improper Certificate Validation
  • CWE-614 Sensitive Cookie in HTTPS Session Without 'Secure' Attribute

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.