Medium severity4.3NVD Advisory· Published Jun 19, 2020· Updated Jun 17, 2026
CVE-2017-18878
CVE-2017-18878
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/mattermost/mattermost-serverGo | < 4.1.2-0.20171004201910-6be8113eb60c | 4.1.2-0.20171004201910-6be8113eb60c |
github.com/mattermost/mattermost-serverGo | >= 4.2.0-rc1, < 4.2.1-0.20171004192657-8fbbd688ea24 | 4.2.1-0.20171004192657-8fbbd688ea24 |
github.com/mattermost/mattermost-serverGo | >= 4.3.0-rc1, < 4.3.0 | 4.3.0 |
Affected products
9- Mattermost/Serverdescription
- osv-coords3 versionspkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2016.0pkg:golang/github.com/mattermost/mattermost-serverpkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2015.6
< 0.0.20260723T184607-160000.1.1+ 2 more
- (no CPE)range: < 0.0.20260723T184607-160000.1.1
- (no CPE)range: < 4.1.2-0.20171004201910-6be8113eb60c
- (no CPE)range: < 0.0.20251230T014957-150000.1.134.1
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*+ 4 more
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*range: <4.1.2
- cpe:2.3:a:mattermost:mattermost_server:4.3.0:rc1:*:*:*:*:*:*
- cpe:2.3:a:mattermost:mattermost_server:4.3.0:rc2:*:*:*:*:*:*
- cpe:2.3:a:mattermost:mattermost_server:4.3.0:rc3:*:*:*:*:*:*
- cpe:2.3:a:mattermost:mattermost_server:4.3.0:rc4:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
7- github.com/advisories/GHSA-h564-6gc2-fcc6ghsaADVISORY
- mattermost.com/security-updates/nvdVendor Advisory
- nvd.nist.gov/vuln/detail/CVE-2017-18878ghsaADVISORY
- github.com/mattermost/mattermost/commit/6be8113eb60cf5ddd2dc1c3f4db05cae0c183086ghsaWEB
- github.com/mattermost/mattermost/commit/8fbbd688ea2466dd0d70e9c07e9703d78f8a19a5ghsaWEB
- github.com/mattermost/mattermost/commit/affd35071ea155069979fd359726296de8aa6aafghsaWEB
- mattermost.com/security-updatesghsaWEB
News mentions
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