> CVE-2026-41259 [HIGH]

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PUBLISHED
2026-04-23 19:17
MODIFIED
2026-04-23 19:17
CVSS_SCORE V3
8.2
EPSS (Prob. Exploit)
0.21%
Top 88.4%
DATA SOURCES:
NVD 🔗 2026-04-23 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-11-08 OSV 🔗 2026-11-02

> DESCRIPTION

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.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

> MÉTRIQUES CVSS DÉTAILLÉES

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
None (N)
Aucune divulgation d'informations
I (Impact Intégrité)
Integrity Impact
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-841

> CWE DETAILED DESCRIPTIONS

CWE-841: Improper Enforcement of Behavioral Workflow - The product supports a session in which more than one behavior must be performed by an actor, but it does not properly ensure that the actor performs the behaviors in the required sequence or timeframe.

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Mastodon: Insufficient verification of email addresses

AFFECTED PACKAGES:
Unknown / Unknown
216 versions affected
ALIASES:
BIT-mastodon-2026-41259, GHSA-5r37-qpwq-2jhh

> HISTORIQUE DES MODIFICATIONS

Première apparition
23/04/2026 19:17
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:59
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-841: Improper Enforcement of Behavioral Workflow - The product supports a session in which more than one behavior must be performed by an actor, but it does not properly ensure that the actor perf...
Nouvelle valeur:
CWE-841: Improper Enforcement of Behavioral Workflow - The product supports a session in which more than one behavior must be performed by an actor, but it does not properly ensure that the actor perf...
📊 ENRICHISSEMENT 01/05/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-841: Improper Enforcement of Behavioral Workflow - The product supports a session in which more than one behavior must be performed by an actor, but it does not properly ensure that the actor perf...
Total des modifications: 2 Dernière mise à jour: 1 week ago

> REFERENCES

https://github.com/mastodon/mastodon/security/advisories/GHSA-5r37-qpwq-2jhh
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