CVE-2026-27221

Acrobat Reader | Improper Certificate Validation (CWE-295)

CVE-2026-27221 is fixed in 2 products on 1 platform, first by Adobe Acrobat Reader DC 25.001.21288, released March 9, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

5.5

No vendor severity

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0012

1st percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
Adobe Acrobat Reader DC	25.001.21288	Adobe Acrobat Reader DC 25.001.21288	Mar 9, 2026
Adobe Acrobat Reader DC (64-bit)	25.001.21288	Adobe Acrobat Reader DC (64-bit) 25.001.21288	Mar 9, 2026

Details

Published
March 10, 2026
Weakness
CWE-295: Improper Certificate Validation (CWE-295)
Vendor advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-27221

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