CVE-2023-43793 — Misskey is an open source, decentralized social media platform

Misskey is an open source, decentralized social media platform. Prior to version 2023.9.0, by editing the URL, a user can bypass the authentication of the Bull dashboard, which is the job queue management UI, and access it. Version 2023.9.0 contains a fix. There are no known work

01What is this vulnerability?

Misskey is an open source, decentralized social media platform. Prior to version 2023.9.0, by editing the URL, a user can bypass the authentication of the Bull dashboard, which is the job queue management UI, and access it. Version 2023.9.0 contains a fix. There are no known workarounds.

02Affected products

Vendor	Product	Versions
misskey-dev	misskey	< 2023.9.0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

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07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-10-04T20:21:29.294Z
• Last modified: 2024-09-20T14:57:07.819Z

09References

• github.com — https://github.com/misskey-dev/misskey/security/advisories/GHSA-9fj2-gjcf-cqqc
• github.com — https://github.com/nexryai/nexkey/security/advisories/GHSA-g8w5-568f-ffwf
• github.com — https://github.com/misskey-dev/misskey/commit/c9aeccb2ab260ceedc126e6e366da8cd13…