OfficialCISA Known Exploited Vulnerabilities
SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel VulnerabilityType Vulnerability
SmarterTools · Auth bypass
SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability
2 sourcesCVE-2026-23760
At a glance
Medium
7-day window, from the last update
ActiveConfirmed in-the-wild exploitation
Evidence-weighted, not popularity
Signal
Actively exploited in the wild — prioritise confirming exposure.
Why Medium
Medium rather than High: exposure is scored at a default because we cannot see your systems or suppliers. If you run or depend on SmarterTools SmarterMail, treat it as High.
Briefing
- Do not treat uncorroborated claims as confirmed breaches.
Questions to ask IT
- Do we run SmarterTools SmarterMail, 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 12 Nov?
Next steps
- Confirm exposure and remediation status for affected products
Vulnerability facts
Full CVE detail CVE-2026-23760- 9.3 · CriticalExploitable over the network without any account, and no one has to click or open anything. High impact on confidentiality, integrity and availability.CVSS:4.0/AV:N/AC:L/AT:N/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:X
- Listed: attacks using it have been seen (on the catalogue since )
- Elevated attack likelihood (~96.4% in 30 days)
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
- CVE-2026-23760 has an estimated attack likelihood score of 0.965 (~96.5% estimated chance of exploitation in the next 30 days; 99.9th percentile) as of 2026-09-24. This is a probability signal from FIRST, not confirmed exploitation.
- CVE-2026-23760 is confirmed as exploited in the wild (US known-exploited catalogue)
- Authoritative catalogues report active exploitation of this vulnerability.
Products and services involved
- SmarterTools SmarterMail88% match confidence · CVE-2026-23760
Same event, different frames
Distinct often headline the same incident differently.
OfficialFIRST EPSS
CVE-2026-23760: elevated exploitation probabilityPulse
Last checked 3d ago · Recheck overdue since 6 Nov 2026, 08:03 UK time · 2 quiet checks collapsed
Update
5 Nov 2026, 08:03 UK time · 3d ago
Suggested changed to 7d.
Listed on the — prioritise confirming exposure and patching.
Drag to pan · Ctrl / ⌘ + scroll or pinch to zoom9 events
2 quiet checks hidden.
Sources
SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability
CVE-2026-23760: elevated exploitation probability
How we know
Statements extracted from sources. Higher confidence means stronger corroboration.
- ClaimedHeadline60% confidence
SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability
- ProbableSummary fact75% confidence
CVE-2026-23760 has an estimated attack likelihood score of 0.965 (~96.5% estimated chance of exploitation in the next 30 days; 99.9th percentile) as of 2026-09-24. This is a probability signal from FIRST, not confirmed exploitation.
- ConfirmedCVE identifier95% confidence
Event involves CVE-2026-23760
- ConfirmedKnown-exploited catalogue98% confidence
CVE-2026-23760 is confirmed as exploited in the wild (US known-exploited catalogue)