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CVE-2023-6202· NVD / CVE Program· CNA Mattermost

Insecure Direct Object Reference in /plugins/focalboard/ api/v2/users of Mattermost Boards

Mattermost fails to perform proper authorization in the /plugins/focalboard/api/v2/users endpoint allowing an attacker who is a guest user and knows the ID of another user to get their information (e.g. name, surname, nickname) via Mattermost Boards.

MediumCVSS 4.3 · v3.1—No exploit Fix available

Noroxi analysis

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Published
Nov 27, 2023
Updated
Jun 17, 2026
EPSS
0.4% · 36th percentile
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Report tools

JSON

Action score

17

Monitor

Low priority for now.

CVSS
17 / 40 · 4.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
4.3
CNA · Mattermost
4.3
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
mattermostmattermost

Affected versions

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

  • mattermost mattermostup to 7.8.12 inclusive
  • mattermost mattermost8.0.0 and later · up to 8.1.3 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Mattermost). Independent of NVD's CPE analysis and usually ahead of it.

  • Mattermost Mattermost

    • 9.0.2, 9.1.1, 7.8.13, 8.1.4not affected
    • up to and including 7.8.12affected · semver
    • up to and including 8.1.3affected · semver
    • up to and including 9.0.1affected · semver
    • up to and including 9.1.0affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Gogithub.com/mattermost/mattermost-server/v6before 7.8.137.8.13
Gogithub.com/mattermost/mattermost/server/v8from 9.0.0 · before 9.0.29.0.2
Gogithub.com/mattermost/mattermost/server/v8from 9.1.0 · before 9.1.19.1.1
Gogithub.com/mattermost/mattermost/server/v8before 8.1.48.1.4

Same product

mattermost: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-39777Malicious remote can invite itself to an arbitrary local channel
    38Monitor
  • CVE-2023-2193Oauth authorization codes do not expire when deauthorizing an oauth2 app
    36Monitor
  • CVE-2019-20851An issue was discovered in Mattermost Mobile Apps before 1.26.0.
    36Monitor
  • CVE-2024-40886One-click Client-Side Path Traversal Leading to CSRF in User Management admin page
    35Monitor
  • CVE-2023-7114Mattermost version 2.10.0 and earlier fails to sanitize deeplink paths, which allows an attacker to perform CSRF attacks against the server.
    35Monitor
  • CVE-2024-39832Permanently local data deletion by malicious remote
    34Monitor

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-server/v67.8.13Package registry (OSV)
Go:github.com/mattermost/mattermost/server/v88.1.4Package registry (OSV)
Go:github.com/mattermost/mattermost/server/v89.0.2Package registry (OSV)
Go:github.com/mattermost/mattermost/server/v89.1.1Package 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.

Variant candidates

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

  • CVE-2024-39777248 days apartMalicious remote can invite itself to an arbitrary local channel
    38Monitor
  • CVE-2024-8071269 days apartSystem Role with edit access to permissions can elevate themselves to system admin
    28Monitor
  • CVE-2024-6428219 days apartLimited DoS due to permitting creating users with user-defined IDs
    26Monitor
  • CVE-2024-39274248 days apartMalicious remote can add users to arbitrary teams and channels
    26Monitor
  • CVE-2024-36492248 days apartExisting local user overwritten by malicious remote
    25Monitor
  • CVE-2024-36257219 days apartLack of permission check when updating the profile picture of a remote user (shared channels enabled)
    21Monitor

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.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

CWE-284 · Improper Access Control

CVSS vector

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

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

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

All records