CVE-2017-18918 json
Mattermost Server does not restrict SAML certificate path for System Administrators
published 6y ago modified 4mo ago also GHSA-5ghq-28r7-qwfj , GO-2026-4460 , EUVD-2017-10008
- cvss
- 4.9
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 40%
- public exploits
- 0
- none known
Summary
An issue was discovered in Mattermost Server before 3.7.3 and 3.6.5. A System Administrator can place a SAML certificate at an arbitrary pathname.
Patch / fix
- go github.com/mattermost/mattermost-server 3.6.5, 3.6.5+incompatible, 3.7.3, 3.7.3+incompatible
- mattermost mattermost_server 3.6.5, 3.7.3
- 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
Is CVE-2017-18918 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:N/I:P/A:N |
| GitHub | 3.1 | 4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server | <3.6.5 >=3.7.0, <3.7.3 <3.6.5+incompatible >=3.7.0+incompatible, <3.7.3+incompatible |
3.6.5 3.7.3 3.6.5+incompatible 3.7.3+incompatible |
Classification
References
-
github.com
/mattermost/mattermost/commit/8ec37570742b67fd640bb3434ea226c655dbf408
web
-
github.com
/mattermost/mattermost/commit/a12e7fdca439948ab097431d68e8f59778fbab81
web
-
mattermost.com
/security-updates/
vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2017-18918
advisory
-
github.com
/mattermost/mattermost
package
-
mattermost.com
/security-updates
web
-
github.com
/advisories/GHSA-5ghq-28r7-qwfj
advisory
Sources
- CVE List CVE-2017-18918
- GitHub Advisory GHSA-5ghq-28r7-qwfj
- NVD CVE-2017-18918
- OSV GO-2026-4460
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.