CVE-2026-28787
WebAuthn replay enables bypass of 2FA in OneUptime <= v10.0.11
Is CVE-2026-28787 being exploited?
Not confirmed. CVE-2026-28787 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.28% probability of exploitation in the next 30 days.
How severe is CVE-2026-28787?
CVE-2026-28787 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-28787?
Yes. A fix has been recorded for CVE-2026-28787. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-28787 affect?
CVE-2026-28787 affects OneUptime WebAuthn <= v10.0.11. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-28787?
Monitor; plan upgrade; enable stronger MFA
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Replayable WebAuthn assertion bypasses 2FA, enabling account takeover.
Monitor only
- affected<= 10.0.11
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.