Mastodon Error Handling Discrepancy Enables Private Status Existence Enumeration
Mastodon is a free, open-source social network server based on ActivityPub. Versions 4.2.27 and prior, 4.3.0 through 4.3.14, 4.4.0 through 4.4.9, 4.5.0 through 4.5.2 have discrepancies in error handling which allow checking whether a given status exists by sending a request with a non-English Accept-Language header. Using this behavior, an attacker who knows the identifier of a particular status they are not allowed to see can confirm whether this status exists or not. This cannot be used to learn the contents of the status or any other property besides its existence. This issue is fixed in versions 4.2.28, 4.3.15, 4.4.10 and 4.5.3.
BIT-mastodon-2025-67500
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:BIT-mastodon-2025-67500
mastodon
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 4.2.28
Source reference:
/affected/0/ranges4.3.15Source reference:
/affected/0/ranges4.4.10Source reference:
/affected/0/ranges4.5.3Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.2.28"
},
{
"introduced": "4.3.0"
},
{
"fixed": "4.3.15"
},
{
"introduced": "4.4.0"
},
{
"fixed": "4.4.10"
},
{
"introduced": "4.5.0"
},
{
"fixed": "4.5.3"
}
]
}
],
"package": {
"name": "mastodon",
"purl": "pkg:bitnami/mastodon",
"ecosystem": "Bitnami"
},
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"
}
],
"database_specific": {
"source": "https://github.com/bitnami/vulndb/tree/main/data/mastodon/BIT-mastodon-2025-67500.json"
}
}
]- Related CVEs
- CVE-2025-67500
Source reference:
/aliases
Publisher severity
low
Source reference: /database_specific/severity
- Event
- #84189 · Revision 1
- Added to Heist Feed
- Publisher date