CVE-2026-23866

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Summary

CVECVE-2026-23866
StatePUBLISHED
AssignerMeta
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 16:16:29 UTC
Updated2026-05-11 20:00:28 UTC
DescriptionIncomplete 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.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

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

EPSS: 0.000100000 probability, percentile 0.011210000 (date 2026-05-12)

Problem Types: CWE-940 | Improper Verification of Source of a Communication Channel (CWE-940) | CWE-940 CWE-940 Improper Verification of Source of a Communication Channel

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
3.1CNACVSS4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:F/RL:O/RC:C

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Whatsapp Whatsapp All All All All
Application Whatsapp Whatsapp All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Facebook WhatsApp For Android affected 2.25.8.0 2.26.7.10 semver Not specified
CNA Facebook WhatsApp For IOS affected 2.25.8.0 2.26.15.72 semver Not specified

References

ReferenceSourceLinkTags
www.whatsapp.com/security/advisories/2026 [email protected] www.whatsapp.com Vendor Advisory
www.facebook.com/security/advisories/cve-2026-23866 [email protected] www.facebook.com Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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