CVE-2017-18905

mediumpriority · track · 21EPSS 0.008 · 56 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.78% (56th) EPSS

CVSS 5 · medium

Is it mine?

7 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-28

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

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondary · OSV

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-613USprimaryCWE-613US

affected products (7)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
mattermost mattermost server< 3.9.2nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server3.10.0 → 3.10.2nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Go github.com/mattermost/mattermost-server< 3.9.2osvUSpkg:golang/github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server< 3.9.2+incompatibleosvUSpkg:golang/github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server3.10.0 → 3.10.2osvUSpkg:golang/github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server3.10.0+incompatible → 3.10.2+incompatibleosvUSpkg:golang/github.com/mattermost/mattermost-server

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-g24c-fx4v-xg9wMattermost Server has Insufficient Session Expiration when used as an OAuth 2.0 service provider2022-05-24ghsa · osvUS
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.
GO-2026-4306Mattermost Server has Insufficient Session Expiration when used as an OAuth 2.0 service provider in github.com/mattermost/mattermost-server2026-01-13vendor · osvUS
Mattermost Server has Insufficient Session Expiration when used as an OAuth 2.0 service provider in github.com/mattermost/mattermost-server

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv nvd NVD CVE.org MITRE

published 2020-06-19modified 2026-06-17

related (733)

Related entries.

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CVE-2017-6529US	high8.8	2.90% (87th)	Exploit	2017-03-09
An issue was discovered in dnaTools dnaLIMS 4-2015s13. dnaLIMS is vulnerable to session hijacking by guessing the UID parameter.

+728 more

references (4)

External citations — patches, advisories, analysis.

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