CVE-2019-18426

CRITICALNVD 8.29.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-05-23), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.2 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 68%CVSS: 8.2Exploit: cisa kev · ssvc active · epss top5pct · epss high · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A vulnerability in WhatsApp Desktop versions prior to 0.3.9309 when paired with WhatsApp for iPhone versions prior to 2.20.10 allows cross-site scripting and local file reading. Exploiting the vulnerability requires the victim to click a link preview from a specially crafted text message.

CVSS v3
8.2
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
68%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

January 21, 2020

Last Modified

October 24, 2025

Advisory Details (2)

Auto-updated Jun 3, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-18426
generic

Facebook

https://www.facebook.com/security/advisories/cve-2019-18426

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 55× in last 7d / 202× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 595 total refreshes for this CVE.

  1. 2026-08-21 19:48 UTCGHSA enrichment
  2. 2026-08-21 16:49 UTCCISA KEV update
  3. 2026-08-21 15:40 UTCGHSA enrichment
  4. 2026-08-21 11:32 UTCGHSA enrichment
  5. 2026-08-21 07:24 UTCGHSA enrichment
  6. 2026-08-21 03:16 UTCGHSA enrichment
  7. 2026-08-20 23:05 UTCGHSA enrichment
  8. 2026-08-20 18:58 UTCGHSA enrichment
  9. 2026-08-20 17:06 UTCCISA KEV update
  10. 2026-08-20 14:50 UTCGHSA enrichment
  11. 2026-08-20 10:40 UTCGHSA enrichment
  12. 2026-08-20 06:32 UTCGHSA enrichment
  13. 2026-08-20 02:24 UTCGHSA enrichment
  14. 2026-08-19 22:16 UTCGHSA enrichment
  15. 2026-08-19 18:08 UTCEG score recompute
  16. 2026-08-19 18:08 UTCGHSA enrichment
  17. 2026-08-19 17:33 UTCCISA KEV update
  18. 2026-08-19 17:00 UTCEPSS rescore
  19. 2026-08-19 14:00 UTCGHSA enrichment
  20. 2026-08-19 09:51 UTCGHSA enrichment
  21. 2026-08-19 05:43 UTCGHSA enrichment
  22. 2026-08-19 01:35 UTCGHSA enrichment
  23. 2026-08-18 21:27 UTCGHSA enrichment
  24. 2026-08-18 17:11 UTCEG score recompute
  25. 2026-08-18 17:11 UTCGHSA enrichment
Show 75 more
  1. 2026-08-18 16:58 UTCCISA KEV update
  2. 2026-08-18 13:44 UTCEPSS rescore
  3. 2026-08-18 13:00 UTCGHSA enrichment
  4. 2026-08-18 08:49 UTCGHSA enrichment
  5. 2026-08-18 04:41 UTCGHSA enrichment
  6. 2026-08-18 00:33 UTCGHSA enrichment
  7. 2026-08-17 20:23 UTCGHSA enrichment
  8. 2026-08-17 16:15 UTCEG score recompute
  9. 2026-08-17 16:15 UTCGHSA enrichment
  10. 2026-08-17 13:56 UTCCISA KEV update
  11. 2026-08-17 13:43 UTCEPSS rescore
  12. 2026-08-17 12:07 UTCGHSA enrichment
  13. 2026-08-17 07:58 UTCGHSA enrichment
  14. 2026-08-17 03:51 UTCGHSA enrichment
  15. 2026-08-16 23:43 UTCGHSA enrichment
  16. 2026-08-16 19:35 UTCGHSA enrichment
  17. 2026-08-16 15:27 UTCGHSA enrichment
  18. 2026-08-16 11:19 UTCGHSA enrichment
  19. 2026-08-16 07:11 UTCGHSA enrichment
  20. 2026-08-16 03:03 UTCEG score recompute
  21. 2026-08-16 03:03 UTCGHSA enrichment
  22. 2026-08-16 02:10 UTCEPSS rescore
  23. 2026-08-15 22:55 UTCGHSA enrichment
  24. 2026-08-15 18:47 UTCGHSA enrichment
  25. 2026-08-15 14:39 UTCGHSA enrichment
  26. 2026-08-15 10:31 UTCGHSA enrichment
  27. 2026-08-15 06:23 UTCGHSA enrichment
  28. 2026-08-15 02:10 UTCEG score recompute
  29. 2026-08-15 02:10 UTCGHSA enrichment
  30. 2026-08-15 01:26 UTCEPSS rescore
  31. 2026-08-14 22:02 UTCGHSA enrichment
  32. 2026-08-14 17:55 UTCGHSA enrichment
  33. 2026-08-14 13:47 UTCGHSA enrichment
  34. 2026-08-14 09:39 UTCGHSA enrichment
  35. 2026-08-14 05:32 UTCGHSA enrichment
  36. 2026-08-14 01:24 UTCEG score recompute
  37. 2026-08-14 01:24 UTCGHSA enrichment
  38. 2026-08-13 21:16 UTCGHSA enrichment
  39. 2026-08-13 17:08 UTCGHSA enrichment
  40. 2026-08-13 13:00 UTCGHSA enrichment
  41. 2026-08-13 08:52 UTCGHSA enrichment
  42. 2026-08-13 04:44 UTCGHSA enrichment
  43. 2026-08-13 00:36 UTCGHSA enrichment
  44. 2026-08-12 20:29 UTCGHSA enrichment
  45. 2026-08-12 16:21 UTCEG score recompute
  46. 2026-08-12 16:21 UTCGHSA enrichment
  47. 2026-08-12 13:47 UTCEPSS rescore
  48. 2026-08-12 12:14 UTCGHSA enrichment
  49. 2026-08-12 08:06 UTCGHSA enrichment
  50. 2026-08-12 03:58 UTCGHSA enrichment
  51. 2026-08-11 23:50 UTCGHSA enrichment
  52. 2026-08-11 19:42 UTCGHSA enrichment
  53. 2026-08-11 19:32 UTCCISA KEV update
  54. 2026-08-11 15:35 UTCEG score recompute
  55. 2026-08-11 15:35 UTCGHSA enrichment
  56. 2026-08-11 11:27 UTCGHSA enrichment
  57. 2026-08-11 07:19 UTCGHSA enrichment
  58. 2026-08-11 03:11 UTCGHSA enrichment
  59. 2026-08-10 23:04 UTCGHSA enrichment
  60. 2026-08-10 18:56 UTCGHSA enrichment
  61. 2026-08-10 14:48 UTCEG score recompute
  62. 2026-08-10 14:48 UTCGHSA enrichment
  63. 2026-08-10 10:40 UTCGHSA enrichment
  64. 2026-08-10 06:32 UTCGHSA enrichment
  65. 2026-08-10 02:24 UTCGHSA enrichment
  66. 2026-08-09 22:16 UTCGHSA enrichment
  67. 2026-08-09 18:08 UTCGHSA enrichment
  68. 2026-08-09 14:01 UTCGHSA enrichment
  69. 2026-08-09 09:53 UTCGHSA enrichment
  70. 2026-08-09 05:45 UTCGHSA enrichment
  71. 2026-08-09 01:38 UTCGHSA enrichment
  72. 2026-08-08 21:30 UTCGHSA enrichment
  73. 2026-08-08 17:22 UTCGHSA enrichment
  74. 2026-08-08 13:14 UTCGHSA enrichment
  75. 2026-08-08 09:06 UTCGHSA enrichment

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 GitHub PoC) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-48295
    First seen Apr 6, 2020

    WhatsApp Desktop 0.3.9308 - Persistent Cross-Site Scripting

    Open source ↗
  • GitHub PoCHumanSecurity/CVE-2019-18426
    First seen Feb 29, 2020
    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2019-18426?
CVE-2019-18426 is a critical vulnerability published on January 21, 2020. A vulnerability in WhatsApp Desktop versions prior to 0.3.9309 when paired with WhatsApp for iPhone versions prior to 2.20.10 allows cross-site scripting and local file reading. Exploiting the vulnerability requires the victim to click a link preview from a specially crafted text message.
When was CVE-2019-18426 disclosed?
CVE-2019-18426 was first published in the National Vulnerability Database on January 21, 2020, with the most recent update on October 24, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-18426 actively exploited?
Yes. CISA added CVE-2019-18426 to the Known Exploited Vulnerabilities catalog on May 23, 2022, affecting Meta Platforms WhatsApp. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2019-18426?
CVE-2019-18426 has a CVSS v3 base score of 8.2 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2019-18426?
CVE-2019-18426 affects Meta Platforms WhatsApp. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2019-18426?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-18426, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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