Content Credentials SDK EUVD-2026-100739

The target must be an application or service that embeds the CAI Content Credentials SDK and exposes its input-processing path to the network; exploitation requires sending crafted input that the SDK fails to validate properly (CWE-20), bypassing a security feature to obtain write access. Per the CVSS vector exploitation is unauthenticated (PR:N) and requires no user interaction (UI:N) against reachable deployments. LIMITING FACTORS: impact is restricted to integrity (C:N/A:N), so the payoff is unauthorized modification/forgery rather than data theft or disruption; the exact SDK feature, version range, and configuration that expose the vulnerable validation are not specified in the input and should be confirmed against Adobe advisory APSB26-163.

The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N, base 7.5) describes a remotely reachable, low-complexity flaw needing no privileges and no user interaction, with impact confined to integrity (I:H) - consistent with the description of a security-feature bypass yielding unauthorized write access and no confidentiality or availability loss. This is a credible network-facing integrity risk on paper. However, several real-world exploitation signals are MISSING rather than negative: no EPSS probability was provided, the CVE is not listed in CISA KEV, and no public POC is referenced - so there is no public exploit identified at time of analysis and no evidence of active or automatable exploitation. The practical priority is therefore moderate: the flaw is attractive (unauthenticated, network, no UI) but exploitation would target content-authenticity integrity (e.g. forging/altering signed content credentials) rather than granting system compromise, and the affected component is a specialized SDK rather than ubiquitous infrastructure. Note a labeling tension: the input Tag says 'Authentication Bypass' while Adobe's description specifies a 'Security feature bypass' leading to unauthorized write - these are related but not identical, and the vector's C:N argues against a classic credential/auth bypass. Verify the precise bypassed control with Adobe advisory APSB26-163.

A remote, unauthenticated attacker sends crafted or malformed input to an application built on the CAI Content Credentials SDK, exploiting improper input validation (CWE-20) to bypass an intended security check. Because UI and privileges are not required, the attacker gains unauthorized write access - for example tampering with or forging content credential data - without any victim interaction. No public exploit code is identified at time of analysis, so this scenario is inferred from the CVSS vector and Adobe's description.