Mattermost Server up to 4.0.4/4.1.0 Email Template neutralization

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Mattermost Server up to 4.0.4/4.1.0. This impacts an unknown function of the component Email Template Handler. Executing a manipulation can lead to neutralization. This vulnerability is tracked as CVE-2017-18892. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Mattermost Server up to 4.0.4/4.1.0. This vulnerability affects some unknown functionality of the component Email Template Handler. The manipulation with an unknown input leads to a neutralization vulnerability. The CWE definition for the vulnerability is CWE-707. The product does not ensure or incorrectly ensures that structured messages or data are well-formed and that certain security properties are met before being read from an upstream component or sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. E-mail templates can have a field in which HTML content is not neutralized.

The advisory is shared for download at mattermost.com. This vulnerability was named CVE-2017-18892 since 06/19/2020. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading to version 4.0.5, 4.1.1 or 4.2.0 eliminates this vulnerability.

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Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 6.1
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

NVD Base Score: 🔒

Exploitinginfo

Class: Neutralization
CWE: CWE-707 / CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Server 4.0.5/4.1.1/4.2.0

Timelineinfo

06/19/2020 CVE reserved
04/06/2026 +2117 days Advisory disclosed
04/06/2026 +0 days VulDB entry created
04/06/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: mattermost.com
Status: Confirmed

CVE: CVE-2017-18892 (🔒)
GCVE (CVE): GCVE-0-2017-18892
GCVE (VulDB): GCVE-100-355672

Entryinfo

Created: 04/06/2026 23:32
Changes: 04/06/2026 23:32 (71)
Complete: 🔍
Submitter: nike49424
Cache ID: 216:D6F:103

Submitinfo

Accepted

  • Submit #797475: #XSS | #EmailSecurity Mattermost TemplateInjection < 4.2.0 سيطرة كاملة على بيانات (by nike49424)

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