CVE Explorer
CVE-2026-41259
Mastodon is a free, open-source social network server based on ActivityPub. Prior to v4.5.9, v4.4.16, and v4.3.22, Mastodon allows restricting new user sign-up based on e-mail domain names, and performs basic validation on e-mail addresses, but fails to restrict characters that are interpreted differently by some mailing servers. This vulnerability is fixed in v4.5.9, v4.4.16, and v4.3.22.
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":"< 4.3.22"},{"status":"affected","version":">= 4.4.0-beta.1, < 4.4.16"},{"status":"affected","version":">= 4.5.0-beta.1, < 4.5.9"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:07bcfbb41886efd6d807ab0df85f6b62ebef3a128c730efcc8d3be284738b413 · sha256:5360c03a2da39711… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.2,"baseSeverity":"HIGH","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:N/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:07bcfbb41886efd6d807ab0df85f6b62ebef3a128c730efcc8d3be284738b413 · sha256:5360c03a2da39711… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-841","description":"CWE-841: Improper Enforcement of Behavioral Workflow","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:07bcfbb41886efd6d807ab0df85f6b62ebef3a128c730efcc8d3be284738b413 · sha256:5360c03a2da39711… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"name":"https://github.com/mastodon/mastodon/security/advisories/GHSA-5r37-qpwq-2jhh","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mastodon/mastodon/security/advisories/GHSA-5r37-qpwq-2jhh"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:07bcfbb41886efd6d807ab0df85f6b62ebef3a128c730efcc8d3be284738b413 · sha256:5360c03a2da39711… · /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.