CVE-2026-27221 Acrobat Reader | Improper Certificate Validation (CWE-295)

What is CVE-2026-27221?

CVE-2026-27221 is a medium-severity vulnerability in Adobe Acrobat, published on 10 Mar 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

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.

Weakness: CWE-295

Which versions are affected by CVE-2026-27221?

It affects 3 products.

Products include Adobe Acrobat, Adobe Acrobat Dc, Adobe Acrobat Reader Dc.

How do I fix CVE-2026-27221?

No fix has been published for CVE-2026-27221 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-27221 being exploited?

There is no known exploitation of CVE-2026-27221 in the wild and no public exploit code.

Other vulnerabilities in Adobe Acrobat

• CVE-2021-28550 Adobe Acrobat and Reader Use-After-Free Exploited Critical 9.6
• CVE-2021-21017 Adobe Acrobat and Reader Heap-based Buffer Overflow Exploited High 8.8
• CVE-2014-0546 Adobe Reader and Acrobat Sandbox Bypass Exploited High 8.8
• CVE-2014-0496 Adobe Reader and Acrobat Use-After-Free Exploited High 8.8
• CVE-2013-3346 Adobe Reader and Acrobat Memory Corruption Exploited High 8.8

All Adobe Acrobat vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-99cf-x4r7-cfg6.