CVE-2026-23866
Last modified
CVE-2026-23866 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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.. EPSS estimates a 0.46% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| >= 2.25.8.0, <= 2.26.7.10 | ||
| >= 2.25.8.0, <= 2.26.15.72 |
References
- https://www.facebook.com/security/advisories/cve-2026-23866Third Party Advisory
- https://www.whatsapp.com/security/advisories/2026Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-23866?
How severe is CVE-2026-23866?
How do I fix CVE-2026-23866?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-2386The The Plus Addons for Elementor – Addons for Elementor, Pa…4.3
- CVE-2026-23861Dell Unisphere for PowerMax vApp, version(s) 9.2.4.x, contai…5.4
- CVE-2026-23862Dell ThinOS 10 versions prior to ThinOS 2602_10.0573, contai…7.8
- CVE-2026-23863An attachment spoofing issue in WhatsApp for Windows prior t…6.5
- CVE-2026-23864Multiple denial of service vulnerabilities exist in React Se…7.5
- CVE-2026-23865An integer overflow in the tt_var_load_item_variation_store …5.3
- CVE-2026-23868Giflib contains a double-free vulnerability that is the resu…5.1
- CVE-2026-23869A denial of service vulnerability exists in React Server Com…7.5
- CVE-2026-2387The Event Organiser plugin for WordPress is vulnerable to St…6.4
- CVE-2026-23870A denial of service vulnerability could be triggered by send…7.5
- CVE-2026-23873hustoj is an open source online judge based on PHP/C++/MySQL…9
- CVE-2026-23874ImageMagick is free and open-source software used for editin…5.5
Are you affected by CVE-2026-23866?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST