CVE-2023-2515Network attack vector

System-admin escalation via personal access-token authorization

Published May 12, 2023 · Updated Dec 6, 2024

Incorrect authorization in Mattermost Server releases before 7.1.8, 7.7.4, 7.8.3, or 7.9.2 allows remote authenticated users to become system admins. The authorization flow for editing other users and creating their personal access tokens accepts the caller’s combined delegated permissions without blocking assignment of the system_admin role. Exploitation requires an authenticated account with both permissions and enabled personal access tokens; Mattermost has not disclosed the affected function or endpoint.

CVSS severity4.7
Medium
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Mattermost Server releases before 7.1.8, 7.7.4, 7.8.3, or 7.9.2 allows remote authenticated users to become system admins. The authorization flow for editing other users and creating their personal access tokens accepts the caller’s combined delegated permissions without blocking assignment of the system_admin role. Exploitation requires an authenticated account with both permissions and enabled personal access tokens; Mattermost has not disclosed the affected function or endpoint.

The record

CVE
CVE-2023-2515
Published
May 12, 2023
Updated
Dec 6, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-863, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 6, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=7.1.7
  2. Affected versionversion=0 <=7.7.3
  3. Affected versionversion=0 <=7.8.2
  4. Affected versionversion=0 <=7.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=0 <=7.1.7; version=0 <=7.7.3; version=0 <=7.8.2; version=0 <=7.9.1

Published CVSS scores

4.7Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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