Mastodon quotes control can be bypassed

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-62605
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-10-21 17:15:41 UTC
Updated2026-10-19 16:10:00 UTC
DescriptionMastodon is a free, open-source social network server based on ActivityPub. In Mastodon version 4.4, support for verifiable quote posts with quote controls was added, but it is possible for an attacker to bypass these controls in Mastodon versions prior to 4.4.8 and 4.5.0-beta.2. Mastodon internally treats reblogs as statuses. Since they were not special-treated, an attacker could reblog any post, then quote their reblog, technically quoting themselves, but having the quote feature a preview of the post they did not get authorization for with all of the affordances that would be otherwise denied by the quote controls. This issue has been patched in versions 4.4.8 and 4.5.0-beta.2.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS: 0.002860000 probability, percentile 0.198460000 (date 2026-10-19)

Problem Types: CWE-754 | CWE-754 CWE-754: Improper Check for Unusual or Exceptional Conditions

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Joinmastodon Mastodon All All All All
Application Joinmastodon Mastodon 4.5.0 beta1 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mastodon Mastodon affected >= 4.4.0-beta.1, < 4.4.8 Not specified
CNA Mastodon Mastodon affected = 4.5.0-beta.1 Not specified

References

ReferenceSourceLinkTags
github.com/mastodon/mastodon/releases/tag/v4.4.8 [email protected] github.com Release Notes
github.com/mastodon/mastodon/commit/405a49df44033e7d179f3d44d59fb68a67d5... [email protected] github.com Patch
github.com/mastodon/mastodon/commit/2dc4552229b55e2e4adaef675e68ed7ae123... [email protected] github.com Patch
github.com/mastodon/mastodon/security/advisories/GHSA-8h43-rcqj-wpc6 [email protected] github.com Vendor Advisory
github.com/mastodon/mastodon/releases/tag/v4.5.0-beta.2 [email protected] github.com Release Notes
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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