Vulnerability report

Exploited in the wild High confidence Not in CISA KEV

CVE-2024-52270

PDF Document Spoofing in DropBox Sign(HelloSign)

DropBox(HelloSign) / DropBox Sign · 0 to <= 2024-12-04

View live feed Monitor via API Watch CVE-2024-52270
Severity
CVSS 8.2 · High
Confidence
High
Exploit status
Exploited in the wild
EPSS
0.2%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2024-52270 is an unauthenticated PDF Document Spoofing in DropBox Sign(HelloSign). User Interface (UI) Misrepresentation of Critical Information vulnerability in DropBox Sign(HelloSign) allows Content...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is high. Also confirmed by third-party sources.

Who is affected?

DropBox(HelloSign) / DropBox Sign 0 to <= 2024-12-04.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

PDF Document Spoofing in DropBox Sign(HelloSign)

User Interface (UI) Misrepresentation of Critical Information vulnerability in DropBox Sign(HelloSign) allows Content Spoofing. Displayed version does not show the layer flattened version, once download, If printed (e.g.

via Google Chrome -> Examine the print preview): Will render the vulnerability only, not all layers are flattened. This issue affects DropBox Sign(HelloSign): through 2024-12-04.

DropBox(HelloSign) Affected
DropBox Sign
Through 2024-12-04
Published
05 Dec 2024
Exploitation Reported
21 Sep 2026
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
—

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 21 Sep 2026

A trusted third party reported exploitation.

Proof of concept available

CVE

Recorded 21 Sep 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
CVE First 2026-09-21 18:01 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v4.0

8.2 High
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N/AU:Y/U:Red

EPSS

0.2%

Weaknesses

User Interface (UI) Misrepresentation of Critical Information CWE-451

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

CVE Record exploit — drive.proton.me

cve · Created Unknown

CVE Record exploit — new.space

cve · Created Unknown

CVE Record exploit — loom.com

cve · Created Unknown

Timeline

From disclosure to observed exploitation

  1. 18:01 UTC

    Public PoC available

    Public proof-of-concept code published

  2. 18:01 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  3. 10:55 UTC

    CVE published

    Vulnerability disclosed publicly

  4. 08:35 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2024-52270

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2024-52270",
  "confidence": "High",
  "cvss_score": 8.2,
  "cvss_estimated": false,
  "epss_score": 0.00193,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}