EUVD-2026-62342
GHSA-pc6p-pvrm-j4j5
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Stored XSS fires on victim page-view (UI:R not UI:N); contributor credentials required (PR:L); scope changes to victim browser (S:C); no server availability impact.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
3DescriptionCVE.org
The EWWW Image Optimizer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'data-script' Lazy Load Attribute in Post Content in all versions up to, and including, 8.7.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The exploit is achieved by embedding a crafted img element with class='lazyload' and a data-script attribute pointing to an attacker-controlled URL in post content, which the plugin's bundled lazysizes ls.unveilhooks addon then uses to dynamically create and insert a script element into the DOM at page view time.
AnalysisAI
Stored XSS in the EWWW Image Optimizer WordPress plugin (all versions through 8.7.3) lets authenticated attackers holding contributor-level accounts inject arbitrary JavaScript that executes silently in every subsequent visitor's browser. The exploit embeds a crafted img element with class='lazyload' and a data-script attribute pointing to an attacker-controlled URL in post content; the plugin's bundled lazysizes ls.unveilhooks addon then dynamically inserts a script element into the DOM at page-view time with no domain validation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to control at minimum a contributor-level WordPress account on the target site - this is the only meaningful prerequisite and the primary barrier to exploitation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS vector (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N, base 6.4) contains a metric inconsistency that should be verified with the vendor: the UI:N designation implies no user interaction is required, yet the vulnerability fires only when a victim navigates to the injected page - behavior CVSS 3.1 guidelines classify as UI:R. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remediation is to update EWWW Image Optimizer to the version incorporating fix commit 4488aafaee9212db370a5ed2dcb9bad7912b897d (https://github.com/nosilver4u/ewww-image-optimizer/commit/4488aafaee9212db370a5ed2dcb9bad7912b897d), which adds a domain allowlist enforced both server-side via the eio_lazy_safe_domains WordPress filter and client-side via window.lazySizesConfig.safeDomains. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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