Mattermost doesn't validate that a username returned during bot registration belongs to a bot account
CVSS score
5.3
EPSS probability
%0.3
Risk score
0.0
Published
4 mo ago
Etkilenen ürün ve sürüm için yayımlanan güvenlik güncellemesini uygulayın.
Impact on My Inventory
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Vulnerability description
DayBreach CVE AI Research
CVE-2026-6046 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to validate that a username returned during bot registration belongs to a bot account, which allows an unprivileged attacker to intercept private messages sent by plugins via direct message channels by pre-registering a user account with a predictable plugin bot username. Mattermost Advisory ID: MMSA-2026-00649
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-6046 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | go | github.com/mattermost/mattermost-server | View |
| 2 | go | github.com/mattermost/mattermost-server | View |
| 3 | go | github.com/mattermost/mattermost-server | View |
| 4 | go | github.com/mattermost/mattermost/server/v8 | View |
| 5 | go | github.com/mattermost/mattermost-server | View |
| 6 | go | github.com/mattermost/mattermost-server/v5 | View |
| 7 | go | github.com/mattermost/mattermost-server/v6 | View |
| 8 | go | github.com/mattermost/mattermost/server/v8 | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 5.3 | CVSS 3.x | — | Vector not published | GitHub Advisory |
| 0.0 | CVSS 4.0 | — | Vector not published | GitHub Advisory |
Patch and Remediation Guide
Solution & Remediation Advisory
4 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.
10.11.17+incompatibleOSV düzeltilmiş sürüm: 10.11.17+incompatible
11.5.5+incompatibleOSV düzeltilmiş sürüm: 11.5.5+incompatible
11.6.1+incompatibleOSV düzeltilmiş sürüm: 11.6.1+incompatible
8.0.0-20260428151657-c79c3831061aOSV düzeltilmiş sürüm: 8.0.0-20260428151657-c79c3831061a
Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-6046 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-6046 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
Similar Vulnerabilities
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