CVE-2026-91011— EWWW Image Optimizer < 8.7.7 - Author+ Stored XSS via Image Class Attribute Backreference Expansion
Quick assessment
Affected
Unknown EWWW Image Optimizer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
在 8.7.7 版本之前，EWWW Image Optimizer WordPress 插件在重写页面输出时，未对图像属性值进行充分转义，导致拥有“作者（Author）”级别或更高权限的认证用户可以注入任意 JavaScript 代码。该代码会被存储在已发布的内容中，并会在后续浏览受影响页面的任何用户的浏览器中执行。
Possible ATT&CK Techniques 1 AI
T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-91011
Vulnerability Information
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Vulnerability Title
EWWW Image Optimizer < 8.7.7 - Author+ Stored XSS via Image Class Attribute Backreference Expansion
Source: CVE Program / CVE List V5
Vulnerability Description
The EWWW Image Optimizer WordPress plugin before 8.7.7 does not properly escape image attribute values when it rewrites page output, allowing authenticated users with author-level access and above to inject arbitrary JavaScript that is stored in published content and executes in the browser of any user who later views the affected page.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Unknown | EWWW Image Optimizer | 0 ~ 8.7.7 | - |
|
II. Public POCs for CVE-2026-91011
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-91011 (1)
-
🔗 EWWW Image Optimizer < 8.7.7 – Author+ Stored XSS via Image Class Attribute Backreference Expansion | CVE 2026-91011 | Plugin Vulnerabilities Read full article exploit vdb-entry technical-description
Same Patch Batch · Unknown · 2026-09-17 · 29 CVEs total
| CVE-2026-86801 | 8.8 HIGH | To Do List Member 1.4 - 1.6 - Unauthenticated Stored XSS, File Listing and Deletion via Un |
| CVE-2026-87963 | 8.6 HIGH | Yo 1.1 - 1.3.1 - Unauthenticated SQL Injection via username Parameter |
| CVE-2026-87829 | 4.3 MEDIUM | Checkout Field Manager < 7.9.7 - Subscriber+ Arbitrary Attachment Deletion via Unvalidated |
| CVE-2026-87831 | 4.3 MEDIUM | Checkout Field Manager < 7.9.7 - Subscriber+ Arbitrary Attachment Deletion via Customer Ad |
| CVE-2026-91017 | 3.7 LOW | Robokassa payment gateway for Woocommerce < 1.8.9 - Unauthenticated Payment Bypass via For |
| CVE-2025-15697 | Dictionary <= 1.0 - Reflected XSS via Multiple Parameters | |
| CVE-2026-85128 | Choose User Role at Registration for WooCommerce < 1.3.3 - Unauthenticated Privilege Escal | |
| CVE-2026-85130 | WPLP Cookie Consent < 4.4.4 - Unauthenticated Stored XSS via Consent Logs | |
| CVE-2026-86707 | Private Feed Key <= 0.1 - Unauthenticated Authentication Bypass via 'feedkey' Parameter | |
| CVE-2026-86709 | The Pressengine <= 1.0 - Unauthenticated Authentication Bypass | |
| CVE-2026-86710 | Login with QR <= 1.0.0 - Unauthenticated Authentication Bypass via 'autologin_code' Parame | |
| CVE-2026-86446 | LearnPress 4.4.3 - 4.4.6 - Unauthenticated Quiz Answer Disclosure via check-answer REST En | |
| CVE-2026-87836 | Comments Import & Export 2.1.11 - 2.5.3 - Author+ Comment PII Disclosure via Export | |
| CVE-2026-87786 | Dewa Kirim <= 1.0.0 - Unauthenticated Stored XSS via Checkout Coordinates | |
| CVE-2026-86824 | Newsletter < 9.3.8 - Unauthenticated Subscriber PII Disclosure and Modification via Predic | |
| CVE-2026-86788 | HT Mega 3.2.0 - 3.2.5 - Contributor+ Stored XSS via Section Headline Tag | |
| CVE-2026-90922 | Paid Member Subscriptions < 3.0.9 - Unauthenticated Membership Payment Bypass via PayPal S | |
| CVE-2026-88792 | Dictionary <= 1.0 - Unauthenticated Stored XSS via Direct Dictionary Update | |
| CVE-2026-88795 | wpShopGermany IT-RECHT KANZLEI < 2.4 - Unauthenticated RCE via Predictable API Token | |
| CVE-2026-88904 | PuppyFW <= 0.4.4 - Subscriber+ Arbitrary Blog Options Update and Deletion Leading to Privi |
Showing top 20 of 29 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: EWWW Image Optimizer
-
CVE-2026-84773
WordPress EWWW Image Optimizer plugin <= 8.7.6 - Cross Site -
CVE-2026-15446
EWWW Image Optimizer <= 8.7.3 - Authenticated (Contributor+) -
CVE-2024-31924
WordPress EWWW Image Optimizer plugin <= 7.2.3 - Cross Site -
CVE-2023-40600
WordPress EWWW Image Optimizer Plugin <= 7.2.0 is vulnerable -
CVE-2020-36750
EWWW Image Optimizer <= 5.8.1 - Cross-Site Request Forgery B
Same vendor: Unknown
-
CVE-2026-87831
Checkout Field Manager < 7.9.7 - Subscriber+ Arbitrary Attac -
CVE-2026-87829
Checkout Field Manager < 7.9.7 - Subscriber+ Arbitrary Attac -
CVE-2026-91017
Robokassa payment gateway for Woocommerce < 1.8.9 - Unauthen -
CVE-2026-86801
To Do List Member 1.4 - 1.6 - Unauthenticated Stored XSS, Fi -
CVE-2026-87963
Yo 1.1 - 1.3.1 - Unauthenticated SQL Injection via username
V. Comments for CVE-2026-91011
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