Optimole <= 4.2.18 - Unauthenticated Stored Cross-Site Scripting via Page Profiler srcset Descriptor
CVSS score
7.2
EPSS probability
—
Risk score
0.7
Published
1 h ago
Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.
Impact on My Inventory
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Vulnerability description
DayBreach AI Explanation
Verified against sourcesSources read
1
Source agreement
Tam uyum
Evidence confidence
%55
Short explanation
The Optimole – Optimize Images plugin versions up to and including 4.2.18 contain an unauthenticated stored cross‑site scripting issue via the 'missing_srcsets[*][*].s' parameter. An attacker can inject malicious scripts into pages, which execute when the page is viewed. The REST endpoint’s HMAC signature is exposed in plaintext on pages with an incomplete profile, nullifying the authentication check.
This exploit can run malicious code in visitors’ browsers, leading to data theft or session hijacking.
What should be done?
- Apply the vendor’s fix when it becomes available
- Upgrade Optimole to a version newer than 4.2.18
- Block malicious 'missing_srcsets' parameters with a web application firewall
- Sanitize and encode user‑controlled inputs in the plugin code
- Restrict or require authentication for REST endpoint access
Chain of evidence and sources
Optimole eklentisinin 0‑4.2.18 sürümlerinde kimlik doğrulama gerektirmeyen depolanmış XSS bulunuyor (S0).
Resmi kaynaklarda yama durumu doğrulanamadı; mevcut yama bilgisi yok (S0).
CVE, yüksek şiddette (HIGH) sınıflandırılmış ve CVSS skoru 7.2’dir (S0).
Show the technical text from the sources
The Optimole – Optimize Images | Convert WebP & AVIF | CDN & Lazy Load | Image Optimization plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 's (missing_srcsets[*][*].s)' parameter in all versions up to, and including, 4.2.18 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The HMAC signature required to pass the REST endpoint's authorization check is published in plaintext to unauthenticated visitors inside the inline optimoleDataOptimizer JavaScript object on any page with an incomplete profile, making the effective authentication barrier nonexistent.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CWE: CWE-79
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-120739 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | optimole | Optimole – Optimize Images | Convert WebP & AVIF | CDN & Lazy Load | Image Optimization | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 7.2 | CVSS V3_1 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N | CVE CNA |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-120739 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-120739 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
Similar Vulnerabilities
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