PatchSiren cyber security CVE debrief

CVE-2026-34708 Adobe CVE debrief

CVE-2026-34708 is a Stack-based Buffer Overflow vulnerability affecting Adobe InCopy versions 21.3, 20.5.3, and earlier. This vulnerability could result in arbitrary code execution in the context of the current user. User interaction is required for exploitation, as a victim must open a malicious file.

Vendor: Adobe
Product: InCopy
CVSS: HIGH 7.8
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-06-09
Original CVE updated: 2026-08-28
Advisory published: 2026-06-09
Advisory updated: 2026-08-28

Who should care

Users of Adobe InCopy versions 21.3, 20.5.3, and earlier should apply patches or updates to mitigate this vulnerability.

Technical summary

The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. The CVSS vector is CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. The weakness is categorized as CWE-121.

Defensive priority

HIGH

Recommended defensive actions

Apply patches or updates provided by Adobe to vulnerable InCopy installations.
Ensure users do not open malicious files.

Evidence notes

CVE-2026-34708 was published on [cvePublishedAt] and modified on [cveModifiedAt]. The vulnerability affects InCopy versions 21.3, 20.5.3, and earlier.

Sources and references

Verified primary and authoritative sources

CVE-2026-34708 CVE Program record
Publisher, destination, and source semantics verified

URL: https://www.cve.org/CVERecord?id=CVE-2026-34708

CVE Program - Official CVE Program record with source-provided CVE metadata.
CVE-2026-34708 NVD vulnerability detail
Publisher, destination, and source semantics verified

URL: https://nvd.nist.gov/vuln/detail/CVE-2026-34708

NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Mitigation or vendor reference
Unverified legacy reference

URL: https://helpx.adobe.com/security/products/incopy/apsb26-59.html

[email protected] - Vendor Advisory

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.