Spectra (Ultimate Addons for Gutenberg) < 2.20.0 - Contributor+ Stored CSS Injection via Block Attributes
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-345.
Summary
The Spectra Legacy WordPress plugin before 2.20.0 does not validate or escape several block style attributes before using them to build the CSS it outputs on the front end, allowing users with the Contributor role and above to inject arbitrary CSS into the pages that render the affected block. The injected styles are served to anonymous visitors of those pages and can force external resource loads, deface/redress the page, or exfiltrate data via CSS attribute selectors. JavaScript execution is not possible at this role (the script-tag breakout is removed by KSES), so the impact is limited to CSS injection.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
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 | Spectra Legacy | before 2.20.0 | 2.20.0 | Patch available | CNA |
- Spectra Legacy VendorUnknown Affected before 2.20.0 Fixed in 2.20.0 Patch available CNA
Remediation
- Fix · CNA Spectra Legacy (Unknown) Fixed in 2.20.0
Timeline
- 2026-10-02 Threatist record created from CVE-2026-10827
- 2026-10-03 Alias added: GHSA-jjxc-6f47-pv8f
References
Sources
- CVE-2026-10827 · CVE Program
- CVE-2026-10827 · NVD
- FIRST EPSS
- GHSA-jjxc-6f47-pv8f · GitHub Advisory Database · CC BY 4.0
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