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CVE-2017-18916· NVD / CVE Program· CNA mitre

An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7.

An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. API endpoint access control does not honor an integration permission restriction.

MediumCVSS 5.3 · v3.1—No exploit Fix available
Published
Jun 19, 2020
Updated
Jun 16, 2026
EPSS
0.8% · 54th percentile
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Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.8%

Affected systems

VendorProduct
mattermostmattermost server

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mattermost mattermost serverbefore 3.6.7
  • mattermost mattermost server3.7.0 and later · before 3.7.5
  • mattermost mattermost server3.8.0 and later · before 3.8.2

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Gogithub.com/mattermost/mattermost-serverfrom 3.7.0 · before 3.7.53.7.5
Gogithub.com/mattermost/mattermost-serverfrom 3.7.0+incompatible · before 3.7.5+incompatible3.7.5+incompatible
Gogithub.com/mattermost/mattermost-serverfrom 3.8.0 · before 3.8.23.8.2
Gogithub.com/mattermost/mattermost-serverfrom 3.8.0+incompatible · before 3.8.2+incompatible3.8.2+incompatible
Gogithub.com/mattermost/mattermost-serverbefore 3.6.7-0.20170420152529-0968e4079e0a3.6.7-0.20170420152529-0968e4079e0a
openSUSE:Leap 15.6govulncheck-vulndbbefore 0.0.20260226T182644-150000.1.149.10.0.20260226T182644-150000.1.149.1

Same product

mattermost: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-4858Path traversal in integration action URL leading to arbitrary API execution via system admin’s auth token.
    39Monitor
  • CVE-2025-12421Account Takeover via Code Exchange Endpoint
    39Monitor
  • CVE-2025-12419Account takeover on OAuth/OpenID-enabled servers
    39Monitor
  • CVE-2025-4981Path Traversal Leading to RCE by Any Authenticated Mattermost User
    39Monitor
  • CVE-2023-6458Client side path traversal due to lack of route parameters validation
    39Monitor
  • CVE-2017-18920An issue was discovered in Mattermost Server before 3.6.2.
    39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Go:github.com/mattermost/mattermost-server3.6.7-0.20170420152529-0968e4079e0aPackage registry (OSV)
Go:github.com/mattermost/mattermost-server3.7.5Package registry (OSV)
Go:github.com/mattermost/mattermost-server3.7.5+incompatiblePackage registry (OSV)
Go:github.com/mattermost/mattermost-server3.8.2Package registry (OSV)
Go:github.com/mattermost/mattermost-server3.8.2+incompatiblePackage registry (OSV)
opensuse:govulncheck-vulndb0.0.20260226T182644-150000.1.149.1 · openSUSE:Leap 15.6Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-732 · Incorrect Permission Assignment for Critical Resource

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Noroxi analysis

No Noroxi analysis for this record yet

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Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records