Auth bypass in Cesanta Mongoose
CVE-2026-5246
A vulnerability was determined in Cesanta Mongoose up to 7.20. Affected is the function mg_tls_verify_cert_signature of the file mongoose.c of the component P-384 Public Key Handler. Executing a manipulation can lead to authorization bypas…
EPSS: 0.000 (8.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.
Affected products
- Cesanta Mongoose — versions 7.0, 7.1, 7.2
Weakness classification (CWE)
References
- VDB-354827 | Cesanta Mongoose P-384 Public Key mongoose.c mg_tls_verify_cert_signature authorization (technical-description, Third Party Advisory, VDB Entry, vdb-entry)
- VDB-354827 | CTI Indicators (IOB, IOC, IOA) (signature, Permissions Required, permissions-required, VDB Entry)
- Submit #770104 | Cesanta Mongoose 7.20 Authorization Bypass (Third Party Advisory, VDB Entry, third-party-advisory)
- cna@vuldb.com (Patch, patch)
- cna@vuldb.com (Product, Release Notes, patch)
- cna@vuldb.com (Product, product)
Frequently asked questions
- What is CVE-2026-5246?
- CVE-2026-5246 is a medium-severity vulnerability in Cesanta Mongoose, classified under Improper Authorization. CVSS score: 5.6/10. Published 2026-04-02.
- How severe is CVE-2026-5246?
- Medium severity. CVSS v3 base score is 5.6 out of 10.