Mastodon and Bluesky: DDoS wave continues as Mastodon hit after Bluesky incident

Mastodon Hit by DDoS Attack Following Similar Bluesky Disruption

On April 20, 2026, the decentralized social media platform Mastodon experienced a significant distributed denial-of-service (DDoS) attack, just days after a comparable incident disrupted Bluesky. The attack caused widespread outages for users of the open-source microblogging platform before Mastodon’s team successfully mitigated the issue within hours.

Mastodon’s official updates outlined the attack’s progression:

• 12:58 PM (April 20): The platform confirmed an ongoing DDoS attack and began investigating.
• 3:05 PM (April 20): Countermeasures were deployed, restoring accessibility while monitoring continued.

While the hacker collective 313 Team claimed responsibility for the earlier Bluesky attack, no group has publicly taken credit for the Mastodon disruption. The incident highlights the growing vulnerability of decentralized platforms to large-scale cyber threats. Service was fully restored by the end of the day.

Source: https://securityaffairs.com/191144/cyber-crime/ddos-wave-continues-as-mastodon-hit-after-bluesky-incident.html

Mastodon cybersecurity rating report: https://www.rankiteo.com/company/joinmastodon

Bluesky Social cybersecurity rating report: https://www.rankiteo.com/company/bluesky-pbc

"id": "JOIBLU1776889958",
"linkid": "joinmastodon, bluesky-pbc",
"type": "Cyber Attack",
"date": "4/2026",
"severity": "25",
"impact": "1",
"explanation": "Attack without any consequences"

{'affected_entities': [{'customers_affected': 'Users of the platform',
                        'industry': 'Technology',
                        'name': 'Mastodon',
                        'type': 'Social Media Platform'}],
 'attack_vector': 'Distributed Denial-of-Service (DDoS)',
 'date_detected': '2026-04-20T12:58:00Z',
 'date_publicly_disclosed': '2026-04-20T12:58:00Z',
 'date_resolved': '2026-04-20T00:00:00Z',
 'description': 'On April 20, 2026, the decentralized social media platform '
                'Mastodon experienced a significant distributed '
                'denial-of-service (DDoS) attack, just days after a comparable '
                'incident disrupted Bluesky. The attack caused widespread '
                'outages for users of the open-source microblogging platform '
                'before Mastodon’s team successfully mitigated the issue '
                'within hours.',
 'impact': {'downtime': 'Several hours',
            'operational_impact': 'Widespread outages for users',
            'systems_affected': 'Mastodon platform'},
 'investigation_status': 'Mitigated',
 'lessons_learned': 'Highlights the growing vulnerability of decentralized '
                    'platforms to large-scale cyber threats',
 'references': [{'date_accessed': '2026-04-20',
                 'source': 'Mastodon official updates'}],
 'response': {'communication_strategy': 'Official updates via platform',
              'containment_measures': 'Countermeasures deployed',
              'enhanced_monitoring': 'Yes',
              'incident_response_plan_activated': 'Yes',
              'recovery_measures': 'Service fully restored',
              'remediation_measures': 'Mitigation and monitoring'},
 'title': 'Mastodon Hit by DDoS Attack Following Similar Bluesky Disruption',
 'type': 'DDoS'}