CVE-2023-1776
Stored XSS via SVG attachment on Boards
Boards in Mattermost allows an attacker to upload a malicious SVG image file as an attachment to a card and share it using a direct link to the file.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Stored XSS via SVG attachment on Boards
Boards in Mattermost allows an attacker to upload a malicious SVG image file as an attachment to a card and share it using a direct link to the file.
- Record
CVE-2023-1776- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2023-0891
Boards in Mattermost allows an attacker to upload a malicious SVG image file as an attachment to a card and share it using a direct link to the file.
- Record
EUVD-2023-0891- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-63f2-6959-2pxj
Mattermost vulnerable to cross-site scripting (XSS)
Boards in Mattermost allows an attacker to upload a malicious SVG image file as an attachment to a card and share it using a direct link to the file.
Issue Identifier: MMSA-2023-00139
- Record
GHSA-63f2-6959-2pxj- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
NVD
Boards in Mattermost allows an attacker to upload a malicious SVG image file as an attachment to a card and share it using a direct link to the file.
- Record
CVE-2023-1776- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N - CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
Stored XSS via SVG attachment on Boards
Boards in Mattermost allows an attacker to upload a malicious SVG image file as an attachment to a card and share it using a direct link to the file.
- Record
CVE-2023-1776- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVGHSA-63f2-6959-2pxj
Mattermost vulnerable to cross-site scripting (XSS)
Boards in Mattermost allows an attacker to upload a malicious SVG image file as an attachment to a card and share it using a direct link to the file.
Issue Identifier: MMSA-2023-00139
- Record
GHSA-63f2-6959-2pxj- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVBIT-mattermost-2023-1776 No score
Boards in Mattermost allows an attacker to upload a malicious SVG image file as an attachment to a card and share it using a direct link to the file.
- Record
BIT-mattermost-2023-1776- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/mattermost/mattermost-server/v6Go |
6.0.0 to 6.7.2 | 7.1.6 |
github.com/mattermost/mattermost-serverGo |
7.7.0 to 7.7.1 | 7.7.2 |
github.com/mattermost/mattermost-serverGo |
7.1.0 to 7.1.5 | 7.1.6 |
github.com/mattermost/mattermost-serverGo |
7.8.0 to 7.8.0 | 7.8.1 |
github.com/mattermost/mattermost-server/v5Go |
5.0.0 to 5.39.3 | 7.1.6 |
github.com/mattermost/mattermost-server/v6Go |
3.3.0 to 4.10.10 | 7.1.6 |
mattermostBitnami |
before 7.1.6, 7.7.1 to 7.7.1 | 7.1.6 |
github.com/mattermost/mattermost-server/v6Go |
6.0.0 up to 7.1.6 | 7.1.6 |
github.com/mattermost/mattermost-serverGo |
7.7.0 up to 7.7.2 | 7.7.2 |
github.com/mattermost/mattermost-serverGo |
7.1.0 up to 7.1.6 | 7.1.6 |
github.com/mattermost/mattermost-serverGo |
7.8.0 up to 7.8.1 | 7.8.1 |
github.com/mattermost/mattermost-server/v5Go |
5.0.0 up to 7.1.6 | 7.1.6 |
github.com/mattermost/mattermost-server/v6Go |
3.3.0 up to 7.1.6 | 7.1.6 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-1776 is a high vulnerability (CVSS 7.3) in Mattermost, published March 31, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.45%, the 39th percentile. Fixed in github.com/mattermost/mattermost-server/v6 7.1.6.