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CVE-2026-4020 (GCVE-0-2026-4020)

Vulnerability from cvelistv5 – Published: 2026-03-31 01:24 – Updated: 2026-04-08 16:36
VLAI Shadowserver Previdian
Title
Gravity SMTP <= 2.1.4 - Unauthenticated Sensitive Information Exposure via REST API
Summary
The Gravity SMTP plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 2.1.4. This is due to a REST API endpoint registered at /wp-json/gravitysmtp/v1/tests/mock-data with a permission_callback that unconditionally returns true, allowing any unauthenticated visitor to access it. When the ?page=gravitysmtp-settings query parameter is appended, the plugin's register_connector_data() method populates internal connector data, causing the endpoint to return approximately 365 KB of JSON containing the full System Report. This makes it possible for unauthenticated attackers to retrieve detailed system configuration data including PHP version, loaded extensions, web server version, document root path, database server type and version, WordPress version, all active plugins with versions, active theme, WordPress configuration details, database table names, and any API keys/tokens configured in the plugin.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-02 14:14 UTC
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
References
Impacted products
Vendor Product Version CPE status
RocketGenius Gravity SMTP Affected: 0 , ≤ 2.1.4 (semver)
guessed Create a notification for this product.
Credits
Osvaldo Noe Gonzalez Del Rio
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 6b0761de-a4a9-4d9f-9b05-4edb43dee136

Vulnerability ID: CVE-2026-4020

Status: Confirmed

Status Updated: 2026-07-11 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-07-08
Asserted: 2026-07-08
Last Seen: 2026-07-11
Scope
Asset Exposure: ['internet-facing']
Notes: IoT: no | In CISA KEV: no | Honeypot connections on 2026-07-11: 2
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 2
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class None
7D Avg 0
Vendor
30D Avg 0
90D Avg 0
Product
Cisa Kev no
Connections 2
Observation Date 2026-07-11
Vulnerability Class None
Vulnerability Score None
Vulnerability Severity None
References
Created: 2026-07-11 01:00 UTC | Updated: 2026-07-13 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 1d0f87f0-35b7-498e-8c08-7868fef52eff

Vulnerability ID: CVE-2026-4020

Status: Confirmed

Status Updated: 2026-06-17 10:28 UTC

Exploited: Yes

Timestamps
First Seen: 2026-06-17
Asserted: 2026-06-17
Scope
Notes: KEVIntel entry: Gravity SMTP <= 2.1.4 - Unauthenticated Sensitive Information Exposure via REST API | Affected: RocketGenius / Gravity SMTP | CVSS: 7.5 (HIGH) | EPSS: 0.0298 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Gravity SMTP <= 2.1.4 - Unauthenticated Sensitive Information Exposure via REST API
Vendor RocketGenius
Product Gravity SMTP
Added Date 2026-06-17T10:28:34.000Z
Cvss Score 7.5
Epss Score 0.0298
Cvss Severity HIGH
Epss Percentile 0.8552
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-06-23 14:02 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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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.


Detection rules are retrieved from Rulezet.


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.