CVE-2026-23863

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.

CVSS v3.1 Score

6.5

MEDIUM

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

EPSS — Exploit Prediction

0.0001

Probability of exploitation

0.01%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-158 CWE-158

Affected Products

Vendor	Product	Versions
whatsapp	whatsapp	< 2.3000.1032164386.258709

References

Advisories & Patches

https://www.whatsapp.com/security/advisories/2026

Other References

https://www.facebook.com/security/advisories/cve-2026-23863

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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-23863? +

CVE-2026-23863 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0001, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-23863? +

CVE-2026-23863 affects products from whatsapp, specifically: whatsapp. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-23863? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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