EUVD-2026-35787
GHSA-57jj-wrx7-w966
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
1DescriptionCVE.org
InCopy versions 21.3, 20.5.3 and earlier are affected by a Heap-based Buffer Overflow vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
AnalysisAI
Arbitrary code execution in Adobe InCopy versions 21.3, 20.5.3 and earlier occurs when a user opens a maliciously crafted document that triggers a heap-based buffer overflow (CWE-122). Successful exploitation runs attacker code in the security context of the current user, making this a credible vector for endpoint compromise via social engineering. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to actively open an attacker-supplied document in Adobe InCopy 21.3, 20.5.3, or earlier (CVSS AV:L with UI:R) - there is no remote network-triggered path and no listening service is involved. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H reflects a local attack vector (the malicious file must be opened on the victim's machine) requiring user interaction, with high impact across confidentiality, integrity and availability - yielding the 7.8 base score that is typical for client-side document-parsing RCEs. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious InCopy document containing a structure that triggers the heap overflow during parsing and sends it to an editor or copywriter via spear-phishing email, a shared cloud folder, or a compromised freelancer handoff. When the victim double-clicks the file in InCopy, parsing corrupts the heap and yields code execution as the logged-in user, after which the attacker installs a foothold for credential theft, document exfiltration, or lateral movement. |
| Remediation | Apply the updates listed in Adobe Security Bulletin APSB26-59 (https://helpx.adobe.com/security/products/incopy/apsb26-59.html) - install the post-21.3 and post-20.5.3 fixed releases via the Adobe Creative Cloud desktop app or by deploying the updated MSI/PKG packages through your software-management tooling. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Issue security alert to all InCopy users on affected versions and establish guidance to validate document sources before opening. …
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External POC / Exploit Code
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