Vigie VulnEuropean-hosted Vulnerability DB

CVE-2026-86060

SSH session privilege manipulation via a crafted username in Mikrotik RouterOS

At a glance

Severity
CRITICAL 9.2
Exploitation
Known exploited (CISA KEV) · added 2026-09-10
Exploited per ENISA since 2026-09-05
EPSS
EPSS 6.39 % · percentile 94 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
CERT-PL
NVD status
Analyzed

Description

RouterOS contains an argument-handling flaw in the SSH login path involving usernames that begin with a prohibited character, allowing for the trusted RouterOS policy mask to be changed, leading to privilege escalation. Exploitation requires an unauthenticated SSH session to reach the RouterOS login helper.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)

Scores

VersionScoreVectorScored by
CVSS 4.0CRITICAL 9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NCERT-PL
CVSS 4.0CRITICAL 9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XNVD · cvd@cert.pl (Secondary)
CVSS 3.1CRITICAL 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HNVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

European references

Affected configurations (NVD CPE)

Affected products

ProductVersions
Mikrotik · RouterOSaffected 7.24 < 7.24.2 ; affected 7.0.0 < 7.23.4 ; affected 6.0.0 < 6.49.21

References

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
CISA Known Exploited VulnerabilitiesCC0 1.0
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD