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CVE-2026-86060 - RouterOS contains an argument-handling flaw in the SSH login path involving usernames that begin with a prohibited chara

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)
CRITICAL CISA KEV ACTIVELY EXPLOITED
Severity & confidence
Source severityinformational
Platform severitycritical
Confidencehigh
Exploitationactively exploited
CVSS-
Affected
ProductsRouterOS
Reporting sources (2)
NIST NVD - National Vulnerability Database
Open source ↗
CISA - Known Exploited Vulnerabilities
Open source ↗
🎯 Why should I care?
  • On the CISA Known Exploited Vulnerabilities list.
  • Credible sources report active exploitation in the wild.
Timeline & provenance
Published2026-09-05T20:17:18
Last updated2026-10-21T04:58:06
Ingested2026-09-07T15:27:26
FreshnessNEAR-REAL-TIME
Threat typevulnerability
Recommended action
No recommended action published with this item - review the original source.
Next steps
  1. Identify affected systems in your environment.
  2. Apply the vendor patch or mitigation guidance.
  3. Review logs for indicators described in the advisory.
  4. Follow the affected vendor/product to track updates.
Confidence explanation
Reported by a government or cert-grade source (CISA, NCSC, NVD, ENISA, MSRC).
Source type: standards · Original: NIST NVD - National Vulnerability Database