by Kastro
Paper/Archive/CVE-2026-89040

CVE-2026-89040

Tencent Mass Service Engine in Cluster (MSEC) — Tencent Mass Service Engine in Cluster (MSEC) path traversal

EPSS 1%CVSS 9.8
critical.is priorityof 100
43
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 66.7.667 × 2013.3No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Tencent Mass Service Engine in Cluster (MSEC) allows a remote, unauthenticated attacker to send a crafted POST request including ../ and gain root access on the target device. An attacker who uploads a webshell can execute arbitrary code as root.

Affected

ProductAffectedFixed inSource
Mass Service Engine in Cluster (MSEC)all versions–CNA

Scores by source

cisa-cg (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
cisa-cg (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/Tencent/MSECwriteupraw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-258-02.jsonrefcve.org/CVERecord?id=CVE-2026-89040