CVE-2026-10827: CWE-345 Insufficient Verification of Data Authenticity in Spectra Legacy
CVE-2026-10827 is a vulnerability in the Spectra Legacy WordPress plugin before version 2.20.0 that allows users with Contributor role or higher to inject arbitrary CSS into pages rendering the affected block. The plugin does not properly validate or escape several block style attributes before outputting CSS on the front end. Although JavaScript injection is prevented, the CSS injection can be used to force external resource loads, deface or alter page appearance, or exfiltrate data via CSS attribute selectors. The impact is limited to CSS injection without script execution.
AI Analysis
Technical Summary
The Spectra Legacy WordPress plugin versions prior to 2.20.0 suffer from insufficient verification of data authenticity (CWE-345) in block style attributes. This allows users with Contributor role or above to inject arbitrary CSS into the front-end output. The vulnerability arises because the plugin fails to validate or escape style attributes before building CSS, enabling CSS injection attacks. JavaScript execution is not possible due to KSES filtering script tags, limiting the impact to CSS-based attacks such as forced external resource loads, page defacement, or data exfiltration via CSS selectors.
Potential Impact
Users with Contributor role or higher can inject arbitrary CSS into pages using the affected block, which is then served to all visitors. This can lead to forced loading of external resources, visual defacement or alteration of page appearance, and potential data exfiltration through CSS attribute selectors. However, the inability to execute JavaScript reduces the severity compared to full script injection attacks.
Mitigation Recommendations
No official fix or patch is currently confirmed for this vulnerability. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch is available, restrict Contributor role permissions or avoid using the affected plugin version to mitigate risk.
CVE-2026-10827: CWE-345 Insufficient Verification of Data Authenticity in Spectra Legacy
Description
CVE-2026-10827 is a vulnerability in the Spectra Legacy WordPress plugin before version 2.20.0 that allows users with Contributor role or higher to inject arbitrary CSS into pages rendering the affected block. The plugin does not properly validate or escape several block style attributes before outputting CSS on the front end. Although JavaScript injection is prevented, the CSS injection can be used to force external resource loads, deface or alter page appearance, or exfiltrate data via CSS attribute selectors. The impact is limited to CSS injection without script execution.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Spectra Legacy WordPress plugin versions prior to 2.20.0 suffer from insufficient verification of data authenticity (CWE-345) in block style attributes. This allows users with Contributor role or above to inject arbitrary CSS into the front-end output. The vulnerability arises because the plugin fails to validate or escape style attributes before building CSS, enabling CSS injection attacks. JavaScript execution is not possible due to KSES filtering script tags, limiting the impact to CSS-based attacks such as forced external resource loads, page defacement, or data exfiltration via CSS selectors.
Potential Impact
Users with Contributor role or higher can inject arbitrary CSS into pages using the affected block, which is then served to all visitors. This can lead to forced loading of external resources, visual defacement or alteration of page appearance, and potential data exfiltration through CSS attribute selectors. However, the inability to execute JavaScript reduces the severity compared to full script injection attacks.
Mitigation Recommendations
No official fix or patch is currently confirmed for this vulnerability. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch is available, restrict Contributor role permissions or avoid using the affected plugin version to mitigate risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-06-04T09:35:44.199Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a6d96cfbf32cb7a344cecb9
Added to database: 08/01/2026, 06:48:47 UTC
Last enriched: 08/01/2026, 07:23:19 UTC
Last updated: 08/01/2026, 08:06:16 UTC
Views: 4
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.