EWWW Image Optimizer < 8.7.7 - Author+ Stored XSS via Image Class Attribute Backreference Expansion
Priority LOW 32CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00431 37th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed EWWW Image Optimizer (Unknown): 8.7.7
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | EWWW Image Optimizer | before 8.7.7 | 8.7.7 | Patch available | CNA |
- EWWW Image Optimizer VendorUnknown Affected before 8.7.7 Fixed in 8.7.7 Patch available CNA
Remediation
- Fix · CNA EWWW Image Optimizer (Unknown) Fixed in 8.7.7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-91011
- 2026-10-03 Alias added: GHSA-5c4g-pv82-qr56
References
Sources
- CVE-2026-91011 · CVE Program
- CVE-2026-91011 · NVD
- FIRST EPSS
- GHSA-5c4g-pv82-qr56 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences