HTML Injection while inviting Guests
Published Mar 18, 2022
5.4
MEDIUMCVSS 3.1
EPSS 0.65%
Description
Mattermost 6.3.0 and earlier fails to properly sanitize the HTML content in the email invitation sent to guest users, which allows registered users with special permissions to invite guest users to inject unescaped HTML content in the email invitations.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<=6.3
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Mattermost | Mattermost | n/a |
|
- < 6.4.0
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Vendor solution
Update Mattermost to version v6.4 or higher
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
1 other source (CVE.org) ▾
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:S/C:N/I:P/A:N
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Dec 6, 2024 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.65% (0.00650) | 49.26th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.64% (0.00639) | 45.66th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.25% (0.00250) | 46.45th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.06% (0.00058) | 26.59th | v3 (v2023.03.01) |
| Apr 11, 2024 | 0.06% (0.00058) | 23.29th | v3 (v2023.03.01) |
| Mar 25, 2023 | 0.06% (0.00056) | 21.26th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.05% (0.00051) | 17.99th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Sep 10, 2022 | 0.89% (0.00885) | 26.24th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00885) | 24.24th | v2 (v2022.01.01) |
| Mar 19, 2022 | 0.89% (0.00885) | 11.45th | v2 (v2022.01.01) |
References (2)
- https://hackerone.com/reports/1443567 x_refsource_MISCExploitThird Party Advisory
- https://mattermost.com/security-updates/ x_refsource_MISCRelease NotesVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://hackerone.com/reports/1443567 | x_refsource_MISCExploitThird Party Advisory | |
| https://mattermost.com/security-updates/ | x_refsource_MISCRelease NotesVendor Advisory |
Change history (0)
No recorded changes yet.