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CVE-2026-50128

Mastodon is a free, open-source social network server based on ActivityPub. From 4.3.0 until 4.5.11 and 4.4.18, Mastodon has a feature to let websites credit authors of their articles. To prevent false attribution claims, Mastodon uses the attributionDomains JSON-LD term, however, an error in how it is defined makes Linked Data Signatures on the toot:attributionDomains property ineffective. An attacker can arbitrarily modify the attributionDomains value of a legitimately signed Update activity a
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:e60c1818e618a13ece46422f18bcdff9d345ba9b4cd6a9e9d7e925cb45d67f41
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":">= 4.5.0-beta.1, < 4.5.11"},{"status":"affected","version":">= 4.3.0, < 4.4.18"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5eb0f19fbc24dd70b3eede445f38395cbc3f1d585ef1a25077d5f84bbfdc120d · sha256:0597e964d653f280… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5eb0f19fbc24dd70b3eede445f38395cbc3f1d585ef1a25077d5f84bbfdc120d · sha256:0597e964d653f280… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-354","description":"CWE-354: Improper Validation of Integrity Check Value","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5eb0f19fbc24dd70b3eede445f38395cbc3f1d585ef1a25077d5f84bbfdc120d · sha256:0597e964d653f280… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"tags":["exploit"],"url":"https://github.com/gogs/gogs/security/advisories/GHSA-pwx3-qcgw-vh7h"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5eb0f19fbc24dd70b3eede445f38395cbc3f1d585ef1a25077d5f84bbfdc120d · sha256:0597e964d653f280… · /containers/adp/0/references/0
{"name":"https://github.com/mastodon/mastodon/security/advisories/GHSA-rwcw-vq68-g34p","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mastodon/mastodon/security/advisories/GHSA-rwcw-vq68-g34p"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5eb0f19fbc24dd70b3eede445f38395cbc3f1d585ef1a25077d5f84bbfdc120d · sha256:0597e964d653f280… · /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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