CVE-2026-75634: CAI Content Credentials Auth Bypass Flaw

CVE-2026-75634 Overview

CVE-2026-75634 is an Improper Input Validation vulnerability [CWE-20] in Adobe's Content Authenticity Initiative (CAI) Content Credentials. The flaw allows an attacker to bypass security controls and gain unauthorized limited write access to affected systems. Exploitation requires user interaction, specifically a victim visiting a maliciously crafted URL or interacting with a compromised web page. Adobe documented the issue in security advisory APSB26-147. The vulnerability affects the integrity of content credentials, which are used to verify the provenance and authenticity of digital media assets.

Critical Impact
An attacker who successfully exploits CVE-2026-75634 can bypass CAI security features and perform limited unauthorized write operations, undermining the integrity guarantees that Content Credentials are designed to provide.

Affected Products

Adobe CAI Content Credentials (Content Authenticity SDK)
Refer to Adobe Security Advisory APSB26-147 for the specific affected versions
Applications and workflows that embed the Content Authenticity SDK

Discovery Timeline

2026-09-22 - CVE-2026-75634 published to the National Vulnerability Database (NVD)
2026-09-22 - Last updated in the NVD database

Technical Details for CVE-2026-75634

Vulnerability Analysis

CVE-2026-75634 is classified as Improper Input Validation [CWE-20] within Adobe's CAI Content Credentials component. The affected code path fails to properly validate input before acting on it, allowing an attacker to influence execution in ways the security model did not anticipate. The result is a security feature bypass that grants limited write access without authorization.

The attack is network-based but requires user interaction. The victim must open a crafted URL or engage with content on a compromised page. Confidentiality and availability are not affected; the impact is limited to unauthorized write actions that compromise integrity. Because Content Credentials are used to prove authorship and provenance of digital assets, integrity impact against this component has downstream trust implications for consumers of signed media.

Root Cause

The root cause is missing or insufficient validation of untrusted input processed by the Content Authenticity SDK. When input does not conform to expected structure or constraints, the component still processes it along a code path that assumes validated data. This gap permits an attacker to influence behavior guarded by security checks and reach a state where limited write operations execute outside intended controls.

Attack Vector

Exploitation proceeds over the network and depends on user interaction. An attacker crafts a malicious URL or web page containing input designed to defeat the SDK's validation logic. When the victim visits the resource, the vulnerable component processes the attacker-supplied data. The validation bypass then permits limited unauthorized write access. Attack complexity is low and no privileges are required prior to the user interaction step. Adobe has not reported active exploitation, and no public proof-of-concept is currently listed for this CVE.

No verified proof-of-concept code is publicly available. See Adobe Security Advisory APSB26-147 for vendor-provided technical detail.

Detection Methods for CVE-2026-75634

Indicators of Compromise

Unexpected modifications to Content Credentials metadata or manifest structures on assets that should be immutable.
Access logs showing user navigation to unfamiliar external URLs immediately preceding CAI-related write activity.
Web proxy or browser telemetry recording interaction with pages that reference the Content Authenticity SDK from untrusted origins.

Detection Strategies

Monitor endpoints and applications embedding the Content Authenticity SDK for anomalous write operations against credential stores.
Correlate browser navigation events with subsequent CAI SDK activity to identify user-interaction-driven exploitation attempts.
Compare Content Credentials manifests against known-good baselines to detect tampering consistent with a validation bypass.

Monitoring Recommendations

Enable verbose logging in applications that consume the Content Authenticity SDK and forward logs to a centralized analytics platform.
Alert on write operations to CAI-managed resources originating from browser-driven workflows.
Track outbound requests to third-party domains from creative and publishing workstations that use Content Credentials.

How to Mitigate CVE-2026-75634

Immediate Actions Required

Apply the vendor patches referenced in Adobe Security Advisory APSB26-147 to every deployment of the Content Authenticity SDK.
Inventory all applications and services that embed the CAI SDK and confirm each is on a fixed version.
Advise users of CAI-enabled tools to avoid opening unsolicited links related to content credentials or provenance workflows.

Patch Information

Adobe published the fix in security advisory APSB26-147. Administrators should consult the advisory for the exact fixed SDK version and update all embedding applications accordingly. Development teams distributing software that includes the Content Authenticity SDK should rebuild and release updates against the patched version.

Workarounds

Restrict browser access to untrusted domains from workstations that use Content Credentials tooling.
Enforce click-through warnings or SafeLinks-style URL inspection for links delivered through email and chat.
Segment systems that sign or publish Content Credentials from general-purpose browsing environments until patches are applied.

bash

# Verify installed Content Authenticity SDK version against the fixed release listed in APSB26-147
# Replace <path-to-app> with the deployment path in your environment
grep -R "content-authenticity" <path-to-app> | grep -i version