Low
Mastodon Error Handling Discrepancy Enables Private Status Existence Enumeration
Type: advisorySources: OSV
Mastodon is a free, open-source social network server based on ActivityPub. Versions 4.2.27 and prior, 4.3.0-beta.1 through 4.3.14, 4.4.0-beta.1 through 4.4.9, 4.5.0-beta.1 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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-67500
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 18:15 UTC · Revision 1
Source evidence
Mastodon Error Handling Discrepancy Enables Private Status Existence Enumeration
core-osv · Original sourcePublished 9 Dec 2025, 23:44 UTC
Mastodon is a free, open-source social network server based on ActivityPub. Versions 4.2.27 and prior, 4.3.0-beta.1 through 4.3.14, 4.4.0-beta.1 through 4.4.9, 4.5.0-beta.1 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.
osv:CVE-2025-67500
Complete source record
{
"id": "3c75119444ad6cfa48f88d7547cca10ead638407ddf4d7a9e6affd9b94d81669",
"url": "https://osv.dev/vulnerability/CVE-2025-67500",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Mastodon Error Handling Discrepancy Enables Private Status Existence Enumeration",
"summary": "Mastodon is a free, open-source social network server based on ActivityPub. Versions 4.2.27 and prior, 4.3.0-beta.1 through 4.3.14, 4.4.0-beta.1 through 4.4.9, 4.5.0-beta.1 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.",
"evidence": "osv:CVE-2025-67500",
"products": [],
"severity": "low",
"structured": {
"id": "CVE-2025-67500",
"aliases": [
"BIT-mastodon-2025-67500",
"CVE-2025-67500",
"GHSA-gwhw-gcjx-72v8"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/mastodon/mastodon",
"type": "GIT",
"events": [
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"introduced": "0"
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{
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},
{
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},
{
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},
{
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},
{
"fixed": "d5f12debe0fdd9033f3ef7ee84f9ddf366ffc2e3"
},
{
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},
{
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}
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-67500.json"
}
}
],
"modified": "2026-10-28T02:30:45.050420892Z",
"provider": "osv",
"references": [
"https://github.com/mastodon/mastodon/pull/37077/commits/9957d3218cb33fea6a44bb285e2ba4795a059e4f",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/67xxx/CVE-2025-67500.json",
"https://github.com/mastodon/mastodon/security/advisories/GHSA-gwhw-gcjx-72v8",
"https://nvd.nist.gov/vuln/detail/CVE-2025-67500"
],
"provider_metadata": {
"cwe_ids": [
"CWE-204"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/67xxx/CVE-2025-67500.json"
}
},
"related_cves": [
{
"value": "CVE-2025-67500",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 512644,
"published_at": "2025-12-09T23:44:04.501+00:00"
}