CVE-2023-3591Network attack vector

Account access via reusable password reset tokens

Published Jul 17, 2023 · Updated Oct 21, 2024

Improper authentication in Mattermost releases through 7.8.6, 7.9.4, or 7.10.2 allows remote attackers to reuse old password reset tokens. CreatePasswordRecoveryToken stores a new token without deleting existing password-recovery tokens for the same user, leaving every prior token valid. An attacker must possess an earlier reset link; reusing it permits a password change and subsequent access to the affected account after a newer reset request.

CVSS severity4.8
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Mattermost releases through 7.8.6, 7.9.4, or 7.10.2 allows remote attackers to reuse old password reset tokens. CreatePasswordRecoveryToken stores a new token without deleting existing password-recovery tokens for the same user, leaving every prior token valid. An attacker must possess an earlier reset link; reusing it permits a password change and subsequent access to the affected account after a newer reset request.

The record

CVE
CVE-2023-3591
Published
Jul 17, 2023
Updated
Oct 21, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-287, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 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 <=7.10.2
  2. Affected versionversion=0 <=7.8.6
  3. Affected versionversion=0 <=7.9.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mattermost · Mattermostversion=0 <=7.10.2; version=0 <=7.8.6; version=0 <=7.9.4

Published CVSS scores

4.8Mattermost, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
8.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1078Valid Accounts

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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