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4.3
MEDIUM CVSS 3.1
CVE-2026-23866
WhatsApp iOS/Android Media Content URL Injection Vulnerability
Overview
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.

Details
INFO

Published Date :

May 1, 2026, 4:16 p.m.

Last Modified :

May 11, 2026, 8 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Impact
Affected Products

The following products are affected by CVE-2026-23866 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Whatsapp whatsapp
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM [email protected]
Solution
Update WhatsApp to the latest version to fix media processing vulnerabilities.
  • Update WhatsApp on iOS to the latest version.
  • Update WhatsApp on Android to the latest version.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-23866.

URL Resource
https://www.facebook.com/security/advisories/cve-2026-23866 Third Party Advisory
https://www.whatsapp.com/security/advisories/2026 Vendor Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-23866 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-23866 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-23866 vulnerability anywhere in the article.

  • security.nl
WhatsApp dicht spoofinglek dat uitvoerbare bestanden kon vermommen

WhatsApp heeft een spoofinglek in WhatsApp voor Windows gepatcht waardoor het mogelijk was om uitvoerbare bestanden als een ander soort bestand te vermommen. Daarnaast is een beveiligingslek in WhatsA ... Read more

Published Date: May 05, 2026 (2 weeks, 2 days ago)
  • CybersecurityNews
WhatsApp Vulnerability Lets Attackers Leverage Instagram Reels to Execute Malicious URLs

Meta has disclosed a medium-severity security vulnerability in WhatsApp that could allow threat actors to exploit Instagram Reels integration to trigger arbitrary URL processing on victim devices, pot ... Read more

Published Date: May 05, 2026 (2 weeks, 2 days ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-23866 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    May. 11, 2026

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:android:*:* versions from (including) 2.25.8.0 up to (including) 2.26.7.10 *cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:iphone_os:*:* versions from (including) 2.25.8.0 up to (including) 2.26.15.72
    Added Reference Type Facebook, Inc.: https://www.facebook.com/security/advisories/cve-2026-23866 Types: Third Party Advisory
    Added Reference Type Facebook, Inc.: https://www.whatsapp.com/security/advisories/2026 Types: Vendor Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    May. 01, 2026

    Action Type Old Value New Value
    Added CWE CWE-940
  • CVE Modified by [email protected]

    May. 01, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
  • New CVE Received by [email protected]

    May. 01, 2026

    Action Type Old Value New Value
    Added 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.
    Added Reference https://www.facebook.com/security/advisories/cve-2026-23866
    Added Reference https://www.whatsapp.com/security/advisories/2026
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 4.3
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact