How severe is CVE-2026-23863?

CVE-2026-23863 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-23863 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23863?

CVE-2026-23863 affects Whatsapp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-23863?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-23863 have an EU (EUVD) identifier?

Yes. CVE-2026-23863 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26665.

When was CVE-2026-23863 published?

CVE-2026-23863 was published on 2026-05-01 and last updated on 2026-06-17.

CVE-2026-23863

CVE-2026-23863 is a medium-severity vulnerability in Whatsapp with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-158.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-26665
Weakness: CWE-158
Affected product: Whatsapp
Published: 2026-05-01
Last modified: 2026-06-17

Description

An attachment spoofing issue in WhatsApp for Windows prior to v2.3000.1032164386.258709 could have allowed maliciously formatted documents with embedded NUL bytes in the filename to be shown in the application as one type of file but run as an executable when opened. We have not seen evidence of exploitation in the wild.

Frequently asked questions

What is CVE-2026-23863?: An attachment spoofing issue in WhatsApp for Windows prior to v2.3000.1032164386.258709 could have allowed maliciously formatted documents with embedded NUL bytes in the filename to be shown in the application as one type of file but run as an executable when opened. We have not seen evidence of exploitation in the wild.
How severe is CVE-2026-23863?: CVE-2026-23863 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-23863 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23863?: CVE-2026-23863 affects Whatsapp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-23863?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-23863 have an EU (EUVD) identifier?: Yes. CVE-2026-23863 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26665.
When was CVE-2026-23863 published?: CVE-2026-23863 was published on 2026-05-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:windows:*:*

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