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NVD Vulnerability Details :
CVE-2026-41259
Analyzed
More InfoOfficial Page
Source-security-advisories@github.com
View Known Exploited Vulnerability (KEV) details
Published At-23 Apr, 2026 | 19:17
Updated At-28 Apr, 2026 | 18:50

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.08.2HIGH
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
Primary3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Type: Secondary
Version: 4.0
Base score: 8.2
Base severity: HIGH
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
Type: Primary
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CPE Matches
joinmastodon
joinmastodon
>>mastodon>>Versions before 4.3.22(exclusive)
cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*
joinmastodon
joinmastodon
>>mastodon>>Versions from 4.4.0(inclusive) to 4.4.16(exclusive)
cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*
joinmastodon
joinmastodon
>>mastodon>>Versions from 4.5.0(inclusive) to 4.5.9(exclusive)
cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-841Primarysecurity-advisories@github.com
CWE ID: CWE-841
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/mastodon/mastodon/security/advisories/GHSA-5r37-qpwq-2jhhsecurity-advisories@github.com
Vendor Advisory
Hyperlink: https://github.com/mastodon/mastodon/security/advisories/GHSA-5r37-qpwq-2jhh
Source: security-advisories@github.com
Resource:
Vendor Advisory
Change History
0Changes found
Details not found