Adobe Connect EUVD-2026-29740

Exploitation requires user interaction: a victim must actively visit a maliciously crafted URL or interact with a compromised/attacker-controlled web page that delivers the untrusted serialized data to Adobe Connect (versions 2025.9.15, 2025.8.157 or earlier). No authentication is required of the attacker to stage the malicious content (PR:N), and the vector is network-reachable (AV:N) with low complexity (AC:L), but the mandatory user-interaction step (UI:R) is the primary limiting factor - the attack cannot succeed against a passive or non-interacting user and depends on successful social engineering. No special non-default configuration is indicated beyond running an affected version.

Signals are mixed and should be weighed together rather than on CVSS alone. The CVSS 3.1 base score is 9.6 (AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H) - network reachable, low complexity, no attacker privileges, but crucially requiring user interaction (UI:R), which meaningfully lowers real-world exploitability versus a fully automatic unauthenticated RCE. This is reinforced by SSVC, where CISA's framework rates Exploitation as 'none' and Automatable as 'no' even though Technical Impact is 'total'. EPSS of 1.50% (81st percentile) indicates non-trivial but not high near-term exploitation probability, and there is no KEV listing and no public POC identified. Net: a genuinely high-severity flaw (deserialization RCE with total technical impact) that warrants prompt patching, but the user-interaction requirement and absence of exploitation evidence make it a serious-but-not-emergency priority rather than a mass-exploited internet-facing worm-class issue. One tension worth verifying: the description says code executes 'in the context of the current user' and requires visiting a malicious page, which reads client-side, yet Adobe Connect is primarily a server platform - confirm with the vendor advisory whether the deserialization occurs client-side or server-side.

An attacker crafts a malicious Adobe Connect URL (or plants it on a compromised web page) carrying a serialized-object payload and lures a legitimate user into clicking it; when the victim's Connect session processes the untrusted serialized data, a deserialization gadget chain triggers and arbitrary code runs in the context of that user, with the changed scope allowing impact beyond the immediate component. No public POC is currently identified, and the low attack complexity (AC:L) means a working exploit, once developed, would be straightforward to trigger given the required user interaction.