CVE-2023-1776— Stored XSS via SVG attachment on Boards
Quick assessment
Affected
Mattermost Mattermost
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost 存在安全漏洞，该漏洞源于Boards 允许攻击者将恶意 SVG 图像文件作为附件上传到卡片，并使用文件的直接链接进行共享。
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2023-1776
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Stored XSS via SVG attachment on Boards
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost 存在安全漏洞，该漏洞源于Boards 允许攻击者将恶意 SVG 图像文件作为附件上传到卡片，并使用文件的直接链接进行共享。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Mattermost | Mattermost | 3.3.0 ~ 7.7.1 | - |
|
II. Public POCs for CVE-2023-1776
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2023-1776
请登录查看更多情报信息。
Other References for CVE-2023-1776 (1)
Same Patch Batch · Mattermost · 2023-03-31 · 4 CVEs total
| CVE-2023-1777 | 6.5 MEDIUM | Information disclosure in linked message previews |
| CVE-2023-1775 | 4.3 MEDIUM | Unsanitized events sent over Websocket to regular users in a High Availability environment |
| CVE-2023-1774 | 4.2 MEDIUM | Unauthorized email invite to a private channel |
IV. Related Vulnerabilities
Same product: Mattermost
-
CVE-2026-18799
Mattermost Server fails to restrict Slack import account bin -
CVE-2026-16251
Mattermost local image proxy allows server memory exhaustion -
CVE-2026-18256
Private team metadata disclosure via the team search API -
CVE-2026-18223
Mattermost invitation tokens not bound to invited email addr -
CVE-2026-19076
Mattermost fails to reject OAuth application sessions in acc
Same vendor: Mattermost
-
CVE-2026-18799
Mattermost Server fails to restrict Slack import account bin -
CVE-2026-16251
Mattermost local image proxy allows server memory exhaustion -
CVE-2026-18256
Private team metadata disclosure via the team search API -
CVE-2026-18223
Mattermost invitation tokens not bound to invited email addr -
CVE-2026-19076
Mattermost fails to reject OAuth application sessions in acc
Same weakness: CWE-79
-
CVE-2026-113657
ApostropheCMS sanitize-html: SMIL animation namespace-prefix -
CVE-2026-113654
ApostropheCMS sanitize-html: nonTextTags discard region ends -
CVE-2026-28330
SolarWinds Observability Self-Hosted Cross-Site Scripting Vu -
CVE-2026-112958
ApostropheCMS: Stored XSS via Unescaped Widget Style Attribu -
CVE-2026-113683
VPL for Moodle before 5.0.0 Reflected XSS via similarity/dif
V. Comments for CVE-2023-1776
No comments yet