Versa · Auth bypass
Versa Concerto Authentication Bypass Vulnerability
At a glance
Actively exploited in the wild — prioritise confirming exposure.
Medium rather than High: exposure is scored at a default because we cannot see your systems or suppliers. If you run or depend on Versa Concerto, treat it as High.
Briefing
- Do not treat uncorroborated claims as confirmed breaches.
Questions to ask IT
- Do we run Versa Concerto, and which versions?
- Is any of it reachable from the internet?
- Have we checked whether it has already been used against us?
- If it is not yet patched, what mitigation is in place, and will the fix be done by 16 Nov?
Next steps
- Confirm exposure, mitigation status and any service interruption risk.
Vulnerability facts
Full CVE detail CVE-2025-34026- 9.2 · CriticalExploitable over the network without any account, and no one has to click or open anything. High impact on confidentiality and subsequent confidentiality; low on subsequent integrity.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:L/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:X
- Listed: attacks using it have been seen (on the catalogue since )
- Elevated attack likelihood (~81.8% in 30 days)
- 12.2.0 and earlier
No technical write-up beyond these facts and the summary below yet.
Next steps
- Confirm whether affected products/versions are present and prioritise patching or mitigations
Summary
- 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.
- CVE-2025-34026 is listed in known-exploited catalogue (exploitation in the wild)
- Authoritative catalogues report active exploitation of this vulnerability.
Why this matters in the UK
- Known-exploited catalogue reports exploitation in the wild
Products and services involved
- Versa Concerto82% match confidence · CVE-2025-34026
Part of Vite Vitejs and Versa Concerto vulnerabilities
Pulse
Last checked 26m ago · Next recheck 10 Nov 2026, 02:37 UK time · 4 quiet checks collapsed
in the next 30 days first recorded at 81.8% (elevated likelihood signal, not confirmed exploitation). Suggested changed to 7d.
Elevated — confirm exposure; this is a probability signal, not confirmed exploitation.
2 quiet checks hidden.
Sources
Versa Concerto Improper Authentication Vulnerability
How we know
Statements extracted from sources. Higher confidence means stronger corroboration.
- ConfirmedHeadline90% confidence
Versa Concerto Improper Authentication Vulnerability
- ConfirmedSummary fact75% confidence
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. Affects Versa Concerto. Known ransomware campaign use: Unknown.
- ConfirmedCVE identifier95% confidence
Event involves CVE-2025-34026
- ConfirmedKnown-exploited catalogue98% confidence
CVE-2025-34026 is listed in known-exploited catalogue (exploitation in the wild)