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Exploitation reportedNot in CISA KEV yetFix available

CVE-2021-36888

Exploitation reported by one source. First attested on 2026-03-09 by GCVE · shadowserver.

  • Published2021-12-15
  • Fixed in9.6.1
  • WeaknessCWE-284 · CWE-306

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Unauthenticated Arbitrary Options Update vulnerability leading to full website compromise discovered in Image Hover Effects Ultimate (versions <= 9.6.1) WordPress plugin.

Timeline

dates in UTC
  1. 2021-12-1519:15CVE publishedNVD
  2. 2026-03-0915:34Listed as exploited by GCVEGCVE
  3. 2026-03-0915:34Exploitation first reportedGCVE

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-36888?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-36888?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Blocksera image hover effects
BranchAffectedFixed in
9.6< 9.6.19.6.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As Patchstack, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Oxilab Image Hover Effects Ultimate (WordPress plugin)
    Affected
    • ≥ <= 9.6.1, ≤ 9.6.1no fix statedcustom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2021-12-15

Fix

  1. Update Blocksera image hover effects to 9.6.1

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2021-12-15
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-8fjw-gv37-439q

Frequently asked questions

What is CVE-2021-36888?

Unauthenticated Arbitrary Options Update vulnerability leading to full website compromise discovered in Image Hover Effects Ultimate (versions <= 9.6.1) WordPress plugin.

Is CVE-2021-36888 actively exploited?

Active exploitation of CVE-2021-36888 has not been confirmed. Its EPSS score was 6.5% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-36888?

CVE-2021-36888 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record