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C20/100

Vulnerability · medium

SourceHut Registration Bypass Disclosed as CVE-2026-121728

Tier C · Keep an eye on it – Check if you’re affected

Who’s exposed: SourceHut instances with registration disabled

Tier C because: Hits tech teams

Reach

Attack

Damage

Fix

The Brief

  • A registration bypass affecting SourceHut was disclosed and assigned CVE-2026-121728.
  • The disclosure was posted on Lobsters on 2026-11-05, linking to the researcher's blog post.

Why it matters

The bug allows account registration even where registration has been disabled, so operators relying on that setting to restrict access should review the disclosure.

The checklist behind the tier

Checklist · 1 of 10 yes
YesHits tech teamsSourceHut is a developer code hosting and CI service used by software teams.
NoCore infrastructureA single niche hosting service, not software nearly every team runs.
NoPopular toolSourceHut is a niche forge compared with mainstream platforms like GitHub or GitLab.
NoExploited in the wildLobsters source gives no summary and reports no observed attacks.
NoPublic exploitLobsters source gives no summary and does not say exploit code is published.
NoRemote, no loginLobsters source gives no summary and does not say unauthenticated network access works.
NoFull takeoverLobsters source gives no summary and does not report code execution or account takeover.
NoSecrets exposedLobsters source gives no summary and reports no stolen or exposed data.
NoSupply chainLobsters source gives no summary and reports no compromised packages, updates or pipelines.
NoNo fix yetLobsters source gives no summary and does not say whether a fix exists.

Timeline

  1. Registration bypass disclosed as CVE-2026-121728

  2. Lobsters

    SourceHut disabled registration bypass | CVE-2026-121728

  3. Lobsters

    1 points · 0 comments

Source

SourceHut disabled registration bypass | CVE-2026-121728 ↗ Lobsters · 18h ago

What developers are saying

Based on 0 comments

First seen · 1 source · Full story page · How tiers are decided