CVE-2023-1776 json
Stored XSS via SVG attachment on Boards
published 2023-03-31 3 y ago modified 2026-06-17 4 mo ago also BIT-mattermost-2023-1776 , EUVD-2023-0891 , GHSA-63f2-6959-2pxj
- cvss
- 7.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 39%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- go github.com/mattermost/mattermost-server/v6 7.1.6
- go github.com/mattermost/mattermost-server 7.1.6, 7.7.2, 7.8.1
- go github.com/mattermost/mattermost-server/v5 7.1.6
- bitnami mattermost 7.1.6
- Mattermost Mattermost 7.1.6, 7.7.2, 7.8.0
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 23 mo ago
Exploit prediction
0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N |
| GitHub | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| OSV | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server/v6 | >=6.0.0, <7.1.6 >=3.3.0, <7.1.6 |
7.1.6 |
| go | github.com/mattermost/mattermost-server | >=7.7.0, <7.7.2 >=7.1.0, <7.1.6 >=7.8.0, <7.8.1 |
7.7.2 7.1.6 7.8.1 |
| go | github.com/mattermost/mattermost-server/v5 | >=5.0.0, <7.1.6 |
7.1.6 |
| bitnami | mattermost | <7.1.6 >=7.7.1, <=7.7.1 |
7.1.6 |
Affected products
- Mattermost Mattermost
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
mattermost.com
/security-updates/
vendor-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2023-1776
advisory, web
-
github.com
/mattermost/mattermost-server
package
-
mattermost.com
/security-updates
web
Sources
- CVE List CVE-2023-1776
- GitHub Advisory GHSA-63f2-6959-2pxj
- NVD CVE-2023-1776
- OSV BIT-mattermost-2023-1776
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.