Adobe Connect is widely used; RCE via untrusted data deserialization with no user interaction could disrupt operations.
CVE-2026-27303
Adobe Connect deserialization flaw allows RCE with no user interaction.
Is CVE-2026-27303 being exploited?
Not confirmed. CVE-2026-27303 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 0.61% probability of exploitation in the next 30 days.
How severe is CVE-2026-27303?
CVE-2026-27303 is rated Critical with a CVSS score of 9.6. 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-2026-27303?
Yes. A fix has been recorded for CVE-2026-27303. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-27303 affect?
CVE-2026-27303 affects Adobe Connect (versions 2025.3, 12.10 and earlier). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-27303?
Patch when released; apply vendor mitigations.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
RCE in the current user context via untrusted data deserialization; no user interaction required.
Immediate action required
- affected<= 12.10
- affected<= 2025.3
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.