CVE-2021-36888 (GCVE-0-2021-36888)

Vulnerability from cvelistv5 – Published: 2021-12-15 18:06 – Updated: 2026-04-28 16:07
VLAI Previdian
Title
WordPress Image Hover Effects Ultimate plugin <= 9.6.1 - Unauthenticated Arbitrary Options Update leading to full website compromise
Summary
Unauthenticated Arbitrary Options Update vulnerability leading to full website compromise discovered in Image Hover Effects Ultimate (versions <= 9.6.1) WordPress plugin.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-28 16:16 UTC
CWE
  • CWE-284 - Improper Access Control
References
Impacted products
Vendor Product Version
Oxilab Image Hover Effects Ultimate (WordPress plugin) Affected: <= 9.6.1 , ≤ 9.6.1 (custom)
Create a notification for this product.
Date Public
2021-12-15 00:00
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2021-36888

Status: Confirmed

Status Updated: 2021-12-15 19:06 CET

Exploited: Yes


Timestamps
First Seen: 2021-12-15
Asserted: 2021-12-15

Scope
Notes: WordPress Image Hover Effects Ultimate plugin <= 9.6.1 - Unauthenticated Arbitrary Options Update leading to full website compromise | Affected: Oxilab / Image Hover Effects Ultimate (WordPress plugin) | CVSS: 9.8 (CRITICAL) | EPSS: 0.06685 | Used in malware: unknown | Not yet in CISA KEV: True

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian


Details
Feed Previdian (previdian.com)
Title WordPress Image Hover Effects Ultimate plugin <= 9.6.1 - Unauthenticated Arbitrary Options Update leading to full website compromise
Cve Id CVE-2021-36888
Vendor Oxilab
Ghsa Id None
Product Image Hover Effects Ultimate (WordPress plugin)
Added Date 2021-12-15T18:06:58.000Z
Cvss Score 9.8
Epss Score 0.06685
Previous Ids
Cvss Severity CRITICAL
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.93698
Used In Malware unknown
Vulnerability Id CVE-2021-36888
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True

References

Created: 2026-10-02 09:11 CEST | Updated: 2026-10-02 09:11 CEST
Show details on NVD website

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                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              }
            },
            "problemtype": {
              "problemtype_data": [
                {
                  "description": [
                    {
                      "lang": "eng",
                      "value": "CWE-284 Improper Access Control"
                    }
                  ]
                }
              ]
            },
            "references": {
              "reference_data": [
                {
                  "name": "https://wordpress.org/plugins/image-hover-effects-ultimate/#developers",
                  "refsource": "CONFIRM",
                  "url": "https://wordpress.org/plugins/image-hover-effects-ultimate/#developers"
                },
                {
                  "name": "https://patchstack.com/database/vulnerability/image-hover-effects-ultimate/wordpress-image-hover-effects-ultimate-plugin-9-6-1-unauthenticated-arbitrary-options-update-leading-to-full-website-compromise",
                  "refsource": "CONFIRM",
                  "url": "https://patchstack.com/database/vulnerability/image-hover-effects-ultimate/wordpress-image-hover-effects-ultimate-plugin-9-6-1-unauthenticated-arbitrary-options-update-leading-to-full-website-compromise"
                }
              ]
            },
            "solution": [
              {
                "lang": "en",
                "value": "Update to 9.6.2 or higher version."
              }
            ],
            "source": {
              "discovery": "EXTERNAL"
            }
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "21595511-bba5-4825-b968-b78d1f9984a3",
        "assignerShortName": "Patchstack",
        "cveId": "CVE-2021-36888",
        "datePublished": "2021-12-15T18:06:58.217Z",
        "dateReserved": "2021-07-19T00:00:00.000Z",
        "dateUpdated": "2025-03-28T16:16:42.122Z",
        "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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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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