Overview
- Description
- Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 1.3 and prior to versions 3.5.9, 4.0.5, and 4.1.3, an attacker using carefully crafted oEmbed data can bypass the HTML sanitization performed by Mastodon and include arbitrary HTML in oEmbed preview cards. This introduces a vector for cross-site scripting (XSS) payloads that can be rendered in the user's browser when a preview card for a malicious link is clicked through. Versions 3.5.9, 4.0.5, and 4.1.3 contain a patch for this issue.
- Source
- security-advisories@github.com
- NVD status
- Analyzed
Risk scores
CVSS 3.1
- Type
- Primary
- Base score
- 6.1
- Impact score
- 2.7
- Exploitability score
- 2.8
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Severity
- MEDIUM
Weaknesses
- security-advisories@github.com
- CWE-79
Social media
- Hype score
- Not currently trending
Configurations
[
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "B812C873-88F0-4897-B42C-A67FA6EBB394",
"versionEndExcluding": "3.5.9",
"versionStartIncluding": "1.3"
},
{
"criteria": "cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "51150E6A-F99E-4905-A464-2BAC2B1C36C3",
"versionEndExcluding": "4.0.5",
"versionStartIncluding": "4.0.0"
},
{
"criteria": "cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "8AB4CC5C-A9AE-4CD1-8912-B570E2F6E170",
"versionEndExcluding": "4.1.3",
"versionStartIncluding": "4.1.0"
}
],
"operator": "OR"
}
]
}
]