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CVE-2026-27468

Mastodon is a free, open-source social network server based on ActivityPub. FASP registration requires manual approval by an administrator. In versions 4.4.0 through 4.4.13 and 4.5.0 through 4.5.6, actions performed by a FASP to subscribe to account/content lifecycle events or to backfill content did not check properly whether the FASP was actually approved. This only affects Mastodon servers that have opted in to testing the experimental FASP feature by setting the environment variable `EXPERIM
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:253235bf024b2212722bf3a8bd2bc129a71b8d2deef8101f441af06a2f012b47
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"mastodon","vendor":"mastodon","versions":[{"status":"affected","version":">= 4.4.0, < 4.4.14"},{"status":"affected","version":">= 4.5.0, < 4.5.7"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5bf17e6d96d3721f0f73db29c50e956d531ff2ca280c5fdad6b4b310a6150024 · sha256:fe42246ab6ad1ebe… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":4.8,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:U","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5bf17e6d96d3721f0f73db29c50e956d531ff2ca280c5fdad6b4b310a6150024 · sha256:fe42246ab6ad1ebe… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-862","description":"CWE-862: Missing Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5bf17e6d96d3721f0f73db29c50e956d531ff2ca280c5fdad6b4b310a6150024 · sha256:fe42246ab6ad1ebe… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/mastodon/mastodon/commit/6ba6285a73c3a8b281123814d45f534e3bcebb96","tags":["x_refsource_MISC"],"url":"https://github.com/mastodon/mastodon/commit/6ba6285a73c3a8b281123814d45f534e3bcebb96"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5bf17e6d96d3721f0f73db29c50e956d531ff2ca280c5fdad6b4b310a6150024 · sha256:fe42246ab6ad1ebe… · /containers/cna/references/1
{"name":"https://github.com/mastodon/mastodon/security/advisories/GHSA-qgmm-vr4c-ggjg","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mastodon/mastodon/security/advisories/GHSA-qgmm-vr4c-ggjg"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5bf17e6d96d3721f0f73db29c50e956d531ff2ca280c5fdad6b4b310a6150024 · sha256:fe42246ab6ad1ebe… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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