CVE Explorer

CVE-2026-25540

Mastodon is a free, open-source social network server based on ActivityPub. Prior to versions 4.3.19, 4.4.13, 4.5.6, Mastodon is vulnerable to web cache poisoning via `Rails.cache. When AUTHORIZED_FETCH is enabled, the ActivityPub endpoints for pinned posts and featured hashtags have contents that depend on the account that signed the HTTP request. However, these contents are stored in an internal cache and reused with no regards to the signing actor. As a result, an empty response generated for

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:0444b08bee4bef3b4fc8790dcafb7b7c8f37fa061807f896c9b9ad2959b9e723

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"mastodon","vendor":"mastodon","versions":[{"status":"affected","version":"< 4.3.19"},{"status":"affected","version":"< 4.4.13"},{"status":"affected","version":"< 4.5.6"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:248f7def99f9f22c62b640699c2b34180bb1a897b45e4866c826e48cebf4a8db · sha256:ea68a01e56564bcc… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:248f7def99f9f22c62b640699c2b34180bb1a897b45e4866c826e48cebf4a8db · sha256:ea68a01e56564bcc… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-524","description":"CWE-524: Use of Cache Containing Sensitive Information","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:248f7def99f9f22c62b640699c2b34180bb1a897b45e4866c826e48cebf4a8db · sha256:ea68a01e56564bcc… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion

{"name":"https://github.com/mastodon/mastodon/security/advisories/GHSA-ccpr-m53r-mfwr","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mastodon/mastodon/security/advisories/GHSA-ccpr-m53r-mfwr"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:248f7def99f9f22c62b640699c2b34180bb1a897b45e4866c826e48cebf4a8db · sha256:ea68a01e56564bcc… · /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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