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CVE-2019-18426 (GCVE-0-2019-18426)

Vulnerability from cvelistv5 – Published: 2020-01-21 20:30 – Updated: 2025-10-21 23:35
VLAI CISA Previdian
Summary
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.
SSVC
Exploitation: active Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-07 12:55 UTC
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (CWE-79)
Assigner
Impacted products
Vendor Product Version CPE status
Facebook WhatsApp Desktop Affected: 0.3.9309
Affected: unspecified , < 0.3.9309 (custom)
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2019-18426

Status: Confirmed

Status Updated: 2022-05-23 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2022-05-23
Asserted: 2022-05-23

Scope
Notes: KEV entry: WhatsApp Cross-Site Scripting Vulnerability | Affected: Meta Platforms / WhatsApp | Description: A vulnerability in WhatsApp Desktop when paired with WhatsApp for iPhone allows cross-site scripting and local file reading. | Required action: Apply updates per vendor instructions. | Due date: 2022-06-13 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2019-18426

Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev


Details
Cwes CWE-79
Feed CISA Known Exploited Vulnerabilities Catalog
Product WhatsApp
Due Date 2022-06-13
Date Added 2022-05-23
Vendorproject Meta Platforms
Vulnerabilityname WhatsApp Cross-Site Scripting Vulnerability
Knownransomwarecampaignuse Unknown

References

Created: 2026-02-02 13:25 UTC | Updated: 2026-02-06 07:53 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2019-18426

Status: Confirmed

Status Updated: 2022-05-23 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2022-05-23
Asserted: 2022-05-23

Scope
Notes: KEVIntel entry: 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... | Affected: Facebook / WhatsApp Desktop | CVSS: 8.2 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: False

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel


Details
Feed KEVIntel (kevintel.com)
Title 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...
Vendor Facebook
Product WhatsApp Desktop
Added Date 2022-05-23T00:00:00.000Z
Cvss Score 8.2
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False

References

Created: 2026-06-23 11:13 UTC | Updated: 2026-06-23 11:13 UTC
Show details on NVD website

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                  "value": "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."
                }
              ]
            },
            "problemtype": {
              "problemtype_data": [
                {
                  "description": [
                    {
                      "lang": "eng",
                      "value": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027) (CWE-79)"
                    }
                  ]
                }
              ]
            },
            "references": {
              "reference_data": [
                {
                  "name": "https://www.facebook.com/security/advisories/cve-2019-18426",
                  "refsource": "CONFIRM",
                  "url": "https://www.facebook.com/security/advisories/cve-2019-18426"
                },
                {
                  "name": "http://packetstormsecurity.com/files/157097/WhatsApp-Desktop-0.3.9308-Cross-Site-Scripting.html",
                  "refsource": "MISC",
                  "url": "http://packetstormsecurity.com/files/157097/WhatsApp-Desktop-0.3.9308-Cross-Site-Scripting.html"
                }
              ]
            }
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "4fc57720-52fe-4431-a0fb-3d2c8747b827",
        "assignerShortName": "facebook",
        "cveId": "CVE-2019-18426",
        "datePublished": "2020-01-21T20:30:15.000Z",
        "dateReserved": "2019-10-25T00:00:00.000Z",
        "dateUpdated": "2025-10-21T23:35:53.174Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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