Bypass of Quote Controls in Mastodon Social Networking Server
CVE-2025-62605

4.3MEDIUM

Key Information:

Vendor

Mastodon

Status
Mastodon
Vendor
CVE Published:
21 October 2025

What is CVE-2025-62605?

Mastodon, the open-source social network server, introduced a feature in version 4.4 to support verifiable quote posts. However, prior versions allow attackers to circumvent these controls. By reblogging posts and quoting their own reblogs, an attacker can generate unauthorized previews of original posts. This exploitation of the quote control system exposes sensitive content that would typically be protected from unauthorized access. The issue has been mitigated in versions 4.4.8 and 4.5.0-beta.2, which implement more robust security measures.

Affected Version(s)

mastodon >= 4.4.0-beta.1, < 4.4.8 < 4.4.0-beta.1, 4.4.8

mastodon = 4.5.0-beta.1 = 4.5.0-beta.1

References

https://github.com/mastodon/mastodon/security/advisories/...
x_refsource_CONFIRM
https://github.com/mastodon/mastodon/commit/2dc4552229b55...
x_refsource_MISC
https://github.com/mastodon/mastodon/commit/405a49df44033...
x_refsource_MISC

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
.
CVE-2025-62605 : Bypass of Quote Controls in Mastodon Social Networking Server