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CVE-2026-23866

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a5d848699422ae1c61bbf656ad7b522c9caac92e8a0b656f955eaa44d8211f85
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"unaffected","product":"WhatsApp for Android","vendor":"Facebook","versions":[{"lessThan":"2.26.7.10","status":"affected","version":"2.25.8.0","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e5174fb1470ea87a3d648767b126655fb7a9887f2de38c4f7c20230652333c1f · sha256:52d21ed880ee5113… · /containers/cna/affected/0

{"defaultStatus":"unaffected","product":"WhatsApp for iOS","vendor":"Facebook","versions":[{"lessThan":"2.26.15.72","status":"affected","version":"2.25.8.0","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e5174fb1470ea87a3d648767b126655fb7a9887f2de38c4f7c20230652333c1f · sha256:52d21ed880ee5113… · /containers/cna/affected/1
cwe · 2 assertions

{"description":"Improper Verification of Source of a Communication Channel (CWE-940)","lang":"en"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e5174fb1470ea87a3d648767b126655fb7a9887f2de38c4f7c20230652333c1f · sha256:52d21ed880ee5113… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-940","description":"CWE-940 Improper Verification of Source of a Communication Channel","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e5174fb1470ea87a3d648767b126655fb7a9887f2de38c4f7c20230652333c1f · sha256:52d21ed880ee5113… · /containers/adp/0/problemTypes/0/descriptions/0

Affected products and versions

2 source assertions
{"defaultStatus":"unaffected","product":"WhatsApp for Android","vendor":"Facebook","versions":[{"lessThan":"2.26.7.10","status":"affected","version":"2.25.8.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e5174fb1470ea87a3d648767b126655fb7a9887f2de38c4f7c20230652333c1f · sha256:52d21ed880ee5113… · /containers/cna/affected/0
{"defaultStatus":"unaffected","product":"WhatsApp for iOS","vendor":"Facebook","versions":[{"lessThan":"2.26.15.72","status":"affected","version":"2.25.8.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e5174fb1470ea87a3d648767b126655fb7a9887f2de38c4f7c20230652333c1f · sha256:52d21ed880ee5113… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":4.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:F/RL:O/RC:C","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e5174fb1470ea87a3d648767b126655fb7a9887f2de38c4f7c20230652333c1f · sha256:52d21ed880ee5113… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"description":"Improper Verification of Source of a Communication Channel (CWE-940)","lang":"en"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e5174fb1470ea87a3d648767b126655fb7a9887f2de38c4f7c20230652333c1f · sha256:52d21ed880ee5113… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-940","description":"CWE-940 Improper Verification of Source of a Communication Channel","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e5174fb1470ea87a3d648767b126655fb7a9887f2de38c4f7c20230652333c1f · sha256:52d21ed880ee5113… · /containers/adp/0/problemTypes/0/descriptions/0

Source references

2 source assertions
{"tags":["x_refsource_CONFIRM"],"url":"https://www.facebook.com/security/advisories/cve-2026-23866"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e5174fb1470ea87a3d648767b126655fb7a9887f2de38c4f7c20230652333c1f · sha256:52d21ed880ee5113… · /containers/cna/references/0
{"tags":["x_refsource_CONFIRM"],"url":"https://www.whatsapp.com/security/advisories/2026"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e5174fb1470ea87a3d648767b126655fb7a9887f2de38c4f7c20230652333c1f · sha256:52d21ed880ee5113… · /containers/cna/references/1

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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