7.8High
Adobe Indesign
CVE-2026-21304
InDesign Desktop versions 21.0, 19.5.5 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.
What this means for your business
- It affects Adobe Indesign. It matters if your company, or a supplier that handles your data, runs it.
- An attacker can use it only with access to the machine itself, without a login, but only after tricking someone into an action such as opening a file or a link.
- FIRST's prediction model gives it a 0.3% chance of attack attempts being seen in the next 30 days, ranking above 19% of all known flaws.
What to do
- 1Check whether your company or your suppliers run Adobe Indesign, and which version. The affected versions are listed further down this page.
- 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.
Not sure if your company is exposed?
Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.
Scoring
- CVSS
- 7.8 (v3.1)
- Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H- Weakness
- CWE-122
- Assigned by
- psirt@adobe.com
Dates
- Published
- 2026-01-13
- Last modified
- 2026-08-28
- Sources
- NVD
Affected products
- Adobe Indesign- 20.5.1, 21.0 - 21.1
- Apple Macosall versions
- Microsoft Windowsall versions
As listed in the NVD configuration data. Not a statement about your estate.