Auth bypass in Deepmyst Mysti
CVE-2026-13591
A weakness has been identified in DeepMyst Mysti 0.4.0. Affected is the function _isTrackedConversation of the file src/managers/ChannelBridge.ts of the component Contact Tracking. This manipulation of the argument _channelType causes improper authorization. The attack may be initiated remotely. A high degree of complexity is needed for the attack. The exploitability is told to be difficult. The exploit has been made available to the public and could be used for attacks. Patch name: 9b4aff0f106db424aa45a35aa89dd0b8f2eb9a48. It is suggested to install a patch to address this issue.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (22.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 22.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Deepmyst Mysti — versions 0.4.0
Weakness classification (CWE)
References
- github.com/DeepMyst/Mysti/ (product)
- github.com/DeepMyst/Mysti/commit/9b4aff0f106db424aa45a35aa89dd0b8f2eb9a48 (patch)
- github.com/DeepMyst/Mysti/issues/42 (issue-tracking, exploit)
- github.com/DeepMyst/Mysti/pull/43 (issue-tracking, patch)
- vuldb.com/cve/CVE-2026-13591 (third-party-advisory)
- vuldb.com/submit/844480 (third-party-advisory)
- vuldb.com/vuln/374594 (technical-description, vdb-entry)
- vuldb.com/vuln/374594/cti (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-13591?
- CVE-2026-13591 is a medium-severity vulnerability in Deepmyst Mysti, classified under Incorrect Privilege Assignment. CVSS score: 5.0/10. Published 2026-06-29.
- How severe is CVE-2026-13591?
- Medium severity. CVSS v3 base score is 5.0 out of 10.