CVE-2026-34621
Act now ● On CISA KEV — actively exploited
Actively exploited — on the CISA KEV list.
CVSS base
8.6
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
7.1%
93.9th percentile
CISA KEV
Listed
Added 2026-04-13 · patch by 2026-04-27
Weakness / dates
CWE-1321
Published 2026-04-11 · modified 2026-08-28
CVSS breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
| Attack Vector | L | Local |
| Attack Complexity | L | Low |
| Privileges Required | N | None |
| User Interaction | R | Required |
| Scope | C | Changed |
| Confidentiality | H | High |
| Integrity | H | High |
| Availability | H | High |
Timeline
- 2026-04-11 — Published (NVD)
- 2026-04-13 — Added to CISA KEV (actively exploited)
- 2026-04-27 — CISA patch-by deadline
- 2026-08-28 — Last modified (NVD)
Description
Acrobat Reader versions 24.001.30356, 26.001.21367 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') 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.