CVE-2017-18878 json
Mattermost Server allows users with a session ID to revoke another users' session
published 2020-06-19 6 y ago modified 2026-06-17 4 mo ago also GHSA-h564-6gc2-fcc6 , GO-2025-4191 , EUVD-2017-9968
- cvss
- 4.3
- 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 4.3.0, 4.2.1, and 4.1.2. Knowledge of a session ID allows revoking another user's session.
Patch / fix
- go github.com/mattermost/mattermost-server 4.1.2-0.20171004201910-6be8113eb60c, 4.2.1-0.20171004192657-8fbbd688ea24, 4.3.0, 4.3.0+incompatible
- mattermost mattermost_server 4.1.2, 4.2.1
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20251230T014957-150000.1.134.1
suse advisories SUSE-SU-2026:0037-1
- 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 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:N/I:N/A:P |
| GitHub | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server | <4.1.2-0.20171004201910-6be8113eb60c >=4.2.0-rc1, <4.2.1-0.20171004192657-8fbbd688ea24 >=4.3.0-rc1, <4.3.0 >=4.3.0-rc1+incompatible, <4.3.0+incompatible |
4.1.2-0.20171004201910-6be8113eb60c 4.2.1-0.20171004192657-8fbbd688ea24 4.3.0 4.3.0+incompatible |
Classification
References
-
github.com
/mattermost/mattermost/commit/6be8113eb60cf5ddd2dc1c3f4db05cae0c183086
web
-
github.com
/mattermost/mattermost/commit/8fbbd688ea2466dd0d70e9c07e9703d78f8a19a5
web
-
github.com
/mattermost/mattermost/commit/affd35071ea155069979fd359726296de8aa6aaf
web
-
mattermost.com
/security-updates/
vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2017-18878
advisory
-
github.com
/mattermost/mattermost
package
-
mattermost.com
/security-updates
web
-
github.com
/advisories/GHSA-h564-6gc2-fcc6
advisory
Sources
- CVE List CVE-2017-18878
- GitHub Advisory GHSA-h564-6gc2-fcc6
- NVD CVE-2017-18878
- OSV GO-2025-4191
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.