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CVE-2026-23866

MEDIUM
4.3
CVSS Score
Published: May 1, 2026 at 04:02 PM UTC
Updated: October 26, 2026 at 09:10 PM UTC
1 product affected across 1 vendorWhatsApp

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

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 arbitrary URL on another user’s device, including triggering OS-controlled custom URL scheme handlers. We have not seen evidence of exploitation in the wild.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

WhatsApp· Whatsapp
95%
2.25.8.0 ≤ v ≤ 2.26.15.722.25.8.0 ≤ v ≤ 2.26.7.102.25.8.0
Affected range stops below 2.26.15.72, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.26.7.10, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_CONFIRMThird Party Advisory
Source: cverecord
https://www.facebook.com/security/advisories/cve-2026-23866
x_refsource_CONFIRMVendor Advisory
Source: cverecord
https://www.whatsapp.com/security/advisories/2026

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMMeta
Vector?

Quick Info

StatusANALYZED
CWE
CWE-940

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