CVE-2023-47168Network attack vector

Open redirect via custom-scheme denylist

Published Nov 27, 2023 · Updated Dec 2, 2024

Open redirect in Mattermost 7.8.12, 8.1.3, 9.0.1, and 9.1.0 allows remote attackers to redirect users through a crafted link. RenderMobileError parses redirect_to but rejects only three exact schemes, then places every other scheme in the Back to Mattermost link. No account is required, but a configured OAuth service must reach the mobile error page and a user must click the link, which can launch an attacker-chosen URL handler.

CVSS severity4.3
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in Mattermost 7.8.12, 8.1.3, 9.0.1, and 9.1.0 allows remote attackers to redirect users through a crafted link. RenderMobileError parses redirect_to but rejects only three exact schemes, then places every other scheme in the Back to Mattermost link. No account is required, but a configured OAuth service must reach the mobile error page and a user must click the link, which can launch an attacker-chosen URL handler.

The record

CVE
CVE-2023-47168
Published
Nov 27, 2023
Updated
Dec 2, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-601, CAPEC-178, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 2, 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 <=7.8.12
  2. Affected versionversion=0 <=8.1.3
  3. Affected versionversion=0 <=9.0.1
  4. Affected versionversion=0 <=9.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mattermost · Mattermostversion=0 <=7.8.12; version=0 <=8.1.3; version=0 <=9.0.1; version=0 <=9.1.0

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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 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-601URL Redirection to Untrusted Site ('Open Redirect')
CAPEC-178Cross-Site Flashing
T1566.002Spearphishing Link

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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