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CVE-2017-18908

29
FAUCET Score

CVE-2017-18908 describes a critical vulnerability in Mattermost Server versions prior to 4.0.0, 3.10.2, and 3.9.2, where password reset requests could be inadvertently sent to an attacker-controlled email address. This flaw carries a CVSS score of 9.8 (Critical), indicating a high-impact vulnerability that can be exploited remotely with low complexity, potentially leading to full compromise of user accounts (Confidentiality, Integrity, Availability). While there is no evidence of active exploitation or publicly available exploit code in Metasploit, Nuclei, or ExploitDB, the vulnerability has garnered some community discussion and media coverage, suggesting awareness within the security community.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.9.2CPE matchmatch criteria
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
>= 3.10.0, < 3.10.2CPE matchmatch criteria
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.18%
Probability of exploitation in next 30 days
EPSS Percentile
64.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0118 is in the 50th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

gopatch availablevia ghsa
Product: github.com/mattermost/mattermost-serverFixed in: 3.9.1-rc1
gopatch availablevia ghsa
Product: github.com/mattermost/mattermost-serverFixed in: 3.10.1

Vendor Advisories (1)

goGHSA-34cx-hvm4-vx7jcritical

Mattermost Server password reset email requests can be sent to attacker-provided email addresses

May 24, 2022

References

mattermost.com / security-updates
Vendor Advisory