CVE-2026-23478
Auth bypass in Cal.com allows full account takeover (pre-6.0.7).
Is CVE-2026-23478 being exploited?
Not confirmed. CVE-2026-23478 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 0.46% probability of exploitation in the next 30 days.
How severe is CVE-2026-23478?
CVE-2026-23478 is rated Critical with a CVSS score of 10.0. 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-2026-23478?
Yes. A fix has been recorded for CVE-2026-23478. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-23478 affect?
CVE-2026-23478 affects Cal.com 3.1.6–6.0.6. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-23478?
Upgrade to 6.0.7+ immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Account takeover: attacker can impersonate any user via session.update() with a target email.
Immediate action required
- affected>= 3.1.6 and < 6.0.7
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.