What is CVE-2026-23866?

CVE-2026-23866 is a medium-severity vulnerability in Facebook Whatsapp For Android, classified under Improper Verification of Source of a Communication Channel. CVSS score: 4.3/10. Published 2026-05-01.

How severe is CVE-2026-23866?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Facebook Whatsapp For Android

CVE-2026-23866

Incomplete validation of AI rich response messages for Instagram Reels in WhatsApp for iOS v2.25.8.0 to v2.26.15.72 and WhatsApp for Android v2.25.8.0 to v2.26.7.10 could have allowed a user to trigger processing of media content from an a…

EPSS: 0.000 (1.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Facebook Whatsapp For Android — versions 2.25.8.0
Facebook Whatsapp For Ios — versions 2.25.8.0
Whatsapp

Weakness classification (CWE)

CWE-940 — Improper Verification of Source of a Communication Channel

References

cve-assign@fb.com (x_refsource_CONFIRM, Third Party Advisory)
cve-assign@fb.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-23866?: CVE-2026-23866 is a medium-severity vulnerability in Facebook Whatsapp For Android, classified under Improper Verification of Source of a Communication Channel. CVSS score: 4.3/10. Published 2026-05-01.
How severe is CVE-2026-23866?: Medium severity. CVSS v3 base score is 4.3 out of 10.