CVE-2026-23866

4.3 MEDIUM 0.5% exploit odds Fix listed Other OS & kernel

What it is

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.

At a glance

Exploitability: Can be exploited over the network with a low-privilege account. Limited direct impact.
Exploit odds: 0.5% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-05-01 16:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-26 21:10 UTC Last updatedMost recent change to the record

Details

Published: 2026-05-01 16:16 UTC
Last modified: 2026-10-26 21:10 UTC
Exploit probability: 0.5% · EPSS, next 30 days
Weakness: CWE-940
Record status: Analyzed

Affected

Whatsapp ≤ 2.26.7.10
Whatsapp ≤ 2.26.15.72

Attack profile CVSS 3.1 · 4.3

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: None
Availability: None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

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Fix and advisories

https://www.whatsapp.com/security/advisories/2026

References

NVD record · CVE.org record