Vulnerability report

Active exploitation observed Confirmed confidence Not in CISA KEV

CVE-2026-57739

AcyMailing SMTP Newsletter SQL Injection

AcyMailing Newsletter Team / AcyMailing SMTP Newsletter · 0 to <= 10.11.0

Watch CVE-2026-57739 Browse KEV feed
Severity
CVSS 9.3 · Critical
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
0.4%
First observed
22 Aug 2026
Last observed
07 Oct 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-57739 is an unauthenticated vulnerability affecting AcyMailing Newsletter Team AcyMailing SMTP Newsletter. Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in...

Is it exploited?

Yes. Previdian sensors observed exploitation attempts with confirmed confidence.

Who is affected?

AcyMailing Newsletter Team / AcyMailing SMTP Newsletter 0 to <= 10.11.0.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

AcyMailing SMTP Newsletter SQL Injection

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in AcyMailing Newsletter Team AcyMailing SMTP Newsletter acymailing allows Blind SQL Injection.This issue affects AcyMailing SMTP Newsletter: from n/a through <= 10.11.0.

AcyMailing Newsletter Team Affected
AcyMailing SMTP Newsletter acymailing
Through 10.11.0
Published
13 Jul 2026
Exploitation Reported
22 Aug 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

wordpress

CVE References

  • CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-57739
  • VDB Entry — patchstack.com patchstack.com · VDB Entry https://patchstack.com/database/Wordpress/Plugin/acymailing/vulnerabi...

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

Previdian

Recorded 22 Aug 2026

Previdian independently recorded this as exploited after first seeing it in honeypot sensors.

Active exploitation observed

Previdian sensor

First observed 22 Aug 2026

Previdian first observed exploitation attempts targeting this vulnerability in our honeypot sensors.

Known exploited vulnerability sources

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

Learn about Pro API access
Source Added
Previdian Sensors First 2026-08-22 16:39 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Previdian sensors recorded exploitation attempts targeting this vulnerability. The cards and chart show volume, unique attackers, and daily activity.

925

Attempts observed

19

Unique attacker IPs

7

Attacker countries

BG · CH · NL · SC · SE · US · YE

16

Sensors observed

CVE-2026-57739 exploitation attempts over the last 50 days

Daily events observed by Previdian sensors

Updated 09 Oct 2026

0
336
124
418
42
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
0
0
0
1
0
0
0
0
0
1
0
0
21 Aug 31 Aug 10 Sep 20 Sep 9 Oct

First observed 22 Aug 2026 · Last observed 07 Oct 2026

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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
1
4
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 →

Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

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Risk and context

Severity, weaknesses, and research context

CVSS v3.1

9.3 Critical

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

0.4%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') CWE-89

Timeline

From disclosure to observed exploitation

  1. 02:52 UTC

    Indicators of compromise added (19)

    Indicators of compromise recorded

  2. 02:52 UTC

    Observed by Previdian sensors

    Evidence-backed exploitation signal

  3. 08:41 UTC

    CVE published

    Vulnerability disclosed publicly

  4. 08:04 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-2026-57739

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-57739",
  "confidence": "Confirmed",
  "cvss_score": 9.3,
  "cvss_estimated": false,
  "epss_score": 0.004,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 925, "sensors": 16 }
}