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PatchSiren cyber security CVE debrief

CVE-2019-18426 Meta Platforms CVE debrief

CVE-2019-18426 is a cross-site scripting (XSS) vulnerability affecting Meta Platforms' WhatsApp and is listed in CISA's Known Exploited Vulnerabilities catalog. The supplied timeline shows it was published and added to KEV on 2022-05-23, with remediation due by 2022-06-13. Defenders should treat it as a patch-priority issue and verify that all WhatsApp installations follow vendor update guidance.

Vendor
Meta Platforms
Product
WhatsApp
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2022-05-23
Original CVE updated
2022-05-23
Advisory published
2022-05-23
Advisory updated
2022-05-23

Who should care

IT and security teams managing WhatsApp on employee devices, mobile fleets, or other managed endpoints; users and administrators who have not confirmed they are on current vendor-updated versions.

Technical summary

The issue is identified in the supplied sources only as a cross-site scripting problem in WhatsApp. In practical terms, XSS flaws involve untrusted content being handled in a way that can affect client-side rendering. The supplied corpus does not provide affected versions, exploit conditions, or a fuller impact statement.

Defensive priority

High — CISA KEV inclusion indicates known exploitation risk and a firm remediation deadline in the supplied timeline.

Recommended defensive actions

  • Apply WhatsApp updates according to vendor instructions.
  • Inventory managed WhatsApp installations and confirm they are on supported, patched releases.
  • Remove or upgrade unsupported devices and app versions that cannot receive security updates.
  • Treat any broadly deployed WhatsApp environments as urgent remediation candidates and validate patch status against the CISA KEV entry.

Evidence notes

The official CISA KEV feed names the issue "Meta Platforms WhatsApp WhatsApp Cross-Site Scripting Vulnerability" and marks it as a known exploited vulnerability with dateAdded 2022-05-23 and dueDate 2022-06-13. The CVE record and NVD detail confirm the identifier CVE-2019-18426; no CVSS score or affected-version details were supplied in the corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2019-18426 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2019-18426

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2019-18426 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2019-18426

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.