CVE-2017-18905: mattermost mattermost_server Insufficient Session Expiration
Modified
AliasesGHSA-g24c-fx4v-xg9wGO-2026-4306
Published 19-06-2020Last modified 05-08-2024
Vulnerability summary
CVE-2017-18905 is a medium (CVSS 5.3) Insufficient Session Expiration vulnerability in mattermost mattermost_server. EPSS estimates a 0.78% chance of exploitation in the next 30 days, higher than 55.2% of scored vulnerabilities.
CVSS score
5.3/10
010
Medium · v3.1 (NVD)EPSS score
0.78%
0%100%
Low · +0.01 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 2 · Related 2Timeline
- 19-06-2020PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
3 scores · 2 sources · 2 versionsMedium 5.3Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NSourcesAll 2 agree
- OSV · GoEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:P/A:NSourcesSingle source
EPSS trend
Probability
0.78%
Chance of exploitation in the next 30 days
Percentile
55%
Versus all other CVEs
30-day change
Increase +0.01 pp
From 0.77% on 22-09-2026
22-09-202622-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Github.com/mattermost1 product
- mattermost-server< 3.9.2 | ≥ 3.10.0, < 3.10.2 | ≥ 3.10.0+incompatible, < 3.10.2+incompatible
Mattermost1 product
- mattermost_server< 3.9.2 | ≥ 3.10.0, < 3.10.2
2 vendors · 2 products
