CVE-2017-18905 json
Mattermost Server has Insufficient Session Expiration when used as an OAuth 2.0 service provider
published 2020-06-19 6 y ago modified 2026-06-17 4 mo ago also GHSA-g24c-fx4v-xg9w , GO-2026-4306 , EUVD-2017-9995
- cvss
- 5.3
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 56%
- public exploits
- 0
- none known
Summary
An issue was discovered in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2, when used as an OAuth 2.0 service provider, Session invalidation was mishandled.
Patch / fix
- go github.com/mattermost/mattermost-server 3.9.2, 3.9.2+incompatible, 3.10.2, 3.10.2+incompatible
- mattermost mattermost_server 3.9.2, 3.10.2
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20260114T191543-150000.1.137.1
suse advisories SUSE-SU-2026:0142-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
Exploit prediction
0.78% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).
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:N/I:L/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
| GitHub | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server | <3.9.2 >=3.10.0, <3.10.2 <3.9.2+incompatible >=3.10.0+incompatible, <3.10.2+incompatible |
3.9.2 3.10.2 3.9.2+incompatible 3.10.2+incompatible |
Classification
- Weakness
-
- CWE-613 DEPRECATED: Insufficient Session Expiration
References
-
github.com
/mattermost/mattermost/commit/15ad24d160cb4604d0605ebbfa53d11a57820706
web
-
github.com
/mattermost/mattermost/commit/b17fca0d5ee7557e3df1cf1d1da8bd749859e35f
web
-
github.com
/mattermost/mattermost/commit/fbc170733e86f09b46ba754dd03304733d2f482f
web
-
mattermost.com
/security-updates/
vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2017-18905
advisory
-
github.com
/mattermost/mattermost
package
-
mattermost.com
/security-updates
web
-
github.com
/advisories/GHSA-g24c-fx4v-xg9w
advisory
Sources
- CVE List CVE-2017-18905
- GitHub Advisory GHSA-g24c-fx4v-xg9w
- NVD CVE-2017-18905
- OSV GO-2026-4306
Fencer Vulns 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.