What is CVE-2026-27221?

CVE-2026-27221 is a medium-severity vulnerability in Adobe Acrobat Reader, classified under Improper Certificate Validation. CVSS score: 5.5/10. Published 2026-03-10.

How severe is CVE-2026-27221?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Adobe Acrobat Reader

CVE-2026-27221

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…

Vulnerability class: Improper Certificate Validation

EPSS: 0.000 (8.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

Affected products

Adobe Acrobat Reader — versions 0

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

helpx.adobe.com/security/products/acrobat/apsb26-26.html (vendor-advisory)

Frequently asked questions

What is CVE-2026-27221?: CVE-2026-27221 is a medium-severity vulnerability in Adobe Acrobat Reader, classified under Improper Certificate Validation. CVSS score: 5.5/10. Published 2026-03-10.
How severe is CVE-2026-27221?: Medium severity. CVSS v3 base score is 5.5 out of 10.