CVE-2017-18908Network attack vector

Account takeover via request-supplied reset email

Published Jun 19, 2020 · Updated Aug 5, 2024

Improper password recovery in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2 allows remote attackers to receive reset links. The SendPasswordReset function resolves the account but passes the request-supplied email, rather than the stored user.Email value, to SendPasswordResetEmail. Authentication is not required; delivery to an attacker-provided address exposes a valid reset link and enables takeover of the resolved account.

CVSS severity9.8
Critical
EPSS probability1.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper password recovery in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2 allows remote attackers to receive reset links. The SendPasswordReset function resolves the account but passes the request-supplied email, rather than the stored user.Email value, to SendPasswordResetEmail. Authentication is not required; delivery to an attacker-provided address exposes a valid reset link and enables takeover of the resolved account.

The record

CVE
CVE-2017-18908
Published
Jun 19, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-640, CWE-287, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 19, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-640Weak Password Recovery Mechanism for Forgotten Password
CWE-287Improper Authentication
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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