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Vulnerability details: VCID-6bpt-v3m9-akft
Vulnerability ID VCID-6bpt-v3m9-akft
Aliases CVE-2023-1776
GHSA-63f2-6959-2pxj
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.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
System Score Found at
epss 0.0071 https://api.first.org/data/v1/epss?cve=CVE-2023-1776
epss 0.0071 https://api.first.org/data/v1/epss?cve=CVE-2023-1776
epss 0.0071 https://api.first.org/data/v1/epss?cve=CVE-2023-1776
epss 0.0071 https://api.first.org/data/v1/epss?cve=CVE-2023-1776
cvssv3.1 5.4 https://github.com/mattermost/mattermost-server
generic_textual MODERATE https://github.com/mattermost/mattermost-server
cvssv3.1 5.4 https://mattermost.com/security-updates
generic_textual MODERATE https://mattermost.com/security-updates
cvssv3.1 7.3 https://mattermost.com/security-updates/
ssvc Track https://mattermost.com/security-updates/
cvssv3.1 5.4 https://nvd.nist.gov/vuln/detail/CVE-2023-1776
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2023-1776
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2023-1776
https://github.com/mattermost/mattermost-server
https://nvd.nist.gov/vuln/detail/CVE-2023-1776
security-updates https://mattermost.com/security-updates/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/mattermost/mattermost-server
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Found at https://mattermost.com/security-updates
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N Found at https://mattermost.com/security-updates/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2024-12-06T22:55:49Z/ Found at https://mattermost.com/security-updates/
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2023-1776
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.72693
EPSS Score 0.0071
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T17:27:17.071934+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2023/1xxx/CVE-2023-1776.json 38.6.0