Spectra (Ultimate Addons for Gutenberg) < 2.20.0 - Contributor+ Stored CSS Injection via Block Attributes

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-10827
StatePUBLISHED
AssignerWPScan
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-01 07:16:28 UTC
Updated2026-08-05 17:16:39 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 3.5 LOW from ADP

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N

EPSS: 0.001160000 probability, percentile 0.018600000 (date 2026-08-05)

Problem Types: CWE-345 | CWE-345 Insufficient Verification of Data Authenticity | CWE-345 CWE-345 Insufficient Verification of Data Authenticity

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED3.5LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary3.5LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Unknown Spectra Legacy affected 2.20.0 semver Not specified

References

ReferenceSourceLinkTags
wpscan.com/vulnerability/068ac525-423b-42f8-9ef4-f102f948dc78 [email protected] wpscan.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Muni Nitish Kumar Yaddala (en)

CNA: WPScan (en)

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