Exploited vulnerabilities / CVE-2025-34026
Confirmed exploited · authentication bypass · Versa ConcertoCVE-2025-34026
Versa Concerto authentication bypass, confirmed exploited in the wild.
Versa Concerto SD-WAN orchestration platform contains an improper authentication vulnerability in the Traefik reverse proxy configuration, allowing at attacker to access administrative endpoints. The internal Actuator endpoint can be leveraged for access to heap dumps and trace logs.
| CISA's name for it | Versa Concerto Improper Authentication Vulnerability |
|---|---|
| Vendor and product | Versa · Concerto |
| Type | authentication bypass · CWE-288 |
| Exploited | Confirmed by CISA listed 22 January 2026 |
| Likelihood | one of the most likely to be exploited of every vulnerability tracked |
| Deadline | 12 February 2026 · already passed |
| Used in ransomware | Not reported |
| Advisories | security-portal.versa-networks.com ↗ · nvd.nist.gov ↗ |
Three steps, in this order
Apply the vendor fix and restart the affected service.
Put the login or management interface behind a VPN or allow-list; a bypass makes passwords irrelevant.
Rotate credentials and session keys the product holds, and review accounts and configuration changes since the listing date.
| CISA's required action | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. |
|---|
Know before someone else finds it
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CVE-2025-34026 in short
Is CVE-2025-34026 being exploited?
Yes. CISA added CVE-2025-34026 to its Known Exploited Vulnerabilities catalogue on 22 January 2026, which it does only on evidence of exploitation in the wild.
What is the CISA deadline for CVE-2025-34026?
US federal agencies must remediate it by 12 February 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.
How likely is CVE-2025-34026 to be exploited in the next 30 days?
FIRST's Exploit Prediction Scoring System gives it 82%, the 99th percentile of every CVE it scores.
How do I fix CVE-2025-34026?
Apply the vendor fix and restart the affected service. Put the login or management interface behind a VPN or allow-list; a bypass makes passwords irrelevant. Rotate credentials and session keys the product holds, and review accounts and configuration changes since the listing date.
Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.