---
id: CVE-2026-27221
title: >-
  Acrobat Reader versions 24.001.30307, 24.001.30308, 25.001.21265 and earlier
  are affected by an Improper Certificate Validation vulnerability that could
  result in a Security feature bypass
summary: >-
  Acrobat Reader versions 24.001.30307, 24.001.30308, 25.001.21265 and earlier
  are affected by an Improper Certificate Validation vulnerability that could
  result in a Security feature bypass. An attacker could leverage this
  vulnerability t…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N'
cwe:
  - CWE-295
vendor: adobe
product: acrobat_dc
affected:
  - acrobat_dc < 25.001.21288
  - acrobat_reader_dc < 25.001.21288
  - 'acrobat >= 24.001.20604, < 24.001.30356'
patched:
  - acrobat_dc 25.001.21288
  - acrobat_reader_dc 25.001.21288
  - acrobat 24.001.30356
published: '2026-03-10'
updated: '2026-08-28'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-27221'
references:
  - url: 'https://helpx.adobe.com/security/products/acrobat/apsb26-26.html'
    label: psirt@adobe.com
tags:
  - nvd
epss: 0.00145
epssPercentile: 0.03116
ingestedAt: '2026-08-28T13:20:14.971Z'
---

## Overview

Acrobat Reader versions 24.001.30307, 24.001.30308, 25.001.21265 and earlier are affected by an Improper Certificate Validation vulnerability that could result in a Security feature bypass. An attacker could leverage this vulnerability to spoof the identity of a signer. Exploitation of this issue requires user interaction.

## Affected

- `acrobat_dc < 25.001.21288`
- `acrobat_reader_dc < 25.001.21288`
- `acrobat >= 24.001.20604, < 24.001.30356`

## Remediation

Upgrade past the affected range:

- `acrobat_dc 25.001.21288`
- `acrobat_reader_dc 25.001.21288`
- `acrobat 24.001.30356`