Auth bypass in Sourcehut Meta.sr.ht
CVE-2026-121728
SourceHut meta.sr.ht 0.56.11 before 0.89.0 contains an authorization bypass vulnerability that allows unauthenticated attackers to register accounts when public registration is disabled. Attackers can obtain a CSRF token from /login and POST credentials to /register/step2, which invokes the unchecked GraphQL RegisterAccount mutation to create accounts.
Vulnerability class: Broken Access Control
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- git.sr.ht/~sircmpwn/meta.sr.ht/commit/e471ffe75bb6ef11366e46c3b721dd0278f746b5 (patch)
- git.sr.ht/~sircmpwn/meta.sr.ht/commit/1ea24685a76f6456245d0bc7fe6accf6231c4044 (technical-description)
- git.sr.ht/~sircmpwn/meta.sr.ht/tree/0.88.9/item/metasrht/blueprints/auth.py (technical-description)
- git.sr.ht/~sircmpwn/meta.sr.ht/refs/0.89.0 (release-notes)
- blog.arusekk.pl/posts/srht-disabled-registration-bypass/ (technical-description, exploit)
- www.vulncheck.com/advisories/sourcehut-meta-sr-ht-0.56.11-before-0.89.0-registr… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-121728?
- CVE-2026-121728 is a medium-severity vulnerability in Sourcehut Meta.sr.ht, classified under Missing Authorization. CVSS score: 5.3/10. Published 2026-11-03.
- How severe is CVE-2026-121728?
- Medium severity. CVSS v3 base score is 5.3 out of 10.