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Mastodon Error Handling Discrepancy Enables Private Status Existence Enumeration

Type: advisorySource: OSV1 source record

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.

Announced Source revision 1
Original source ↗

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/ranges

4.3.15

Source reference: /affected/0/ranges

4.4.10

Source reference: /affected/0/ranges

4.5.3

Source 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
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