CVE-2026-10827

Spectra Legacy – Gutenberg Blocks < 2.20.0 - Authenticated (Contributor+) CSS Injection

2026-07-20 00:00

Strategic Overview

Status: Patched in 2.20.0
Affected Plugin: Spectra Legacy – Gutenberg Blocks
Affected Version: < 2.20.0
CVSS: 4.3Medium
Weakness type: CWE-20 · Improper Input Validation
CVE: CVE-2026-10827

View all Spectra Legacy – Gutenberg Blocks vulnerabilities

At a glance

CVE-2026-10827 is a medium-severity Improper Input Validation vulnerability in the Spectra Legacy WordPress plugin, affecting versions < 2.20.0. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Contributor level or above. The issue is fixed in version 2.20.0; sites on affected versions should update now. Disclosed July 2026, reported by Muni Nitish Kumar Yaddala.

Vulnerability Overview

The Spectra Legacy – Gutenberg Blocks plugin for WordPress is vulnerable to CSS Injection in all versions up to 2.20.0 (exclusive). This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary CSS into block attributes.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.

CWE-20: Improper Input Validation

Reaching this weakness in Spectra Legacy < 2.20.0 takes an account at Contributor level or above. Improper input validation means the application accepts input without confirming it has the form, type or range the code downstream assumes.

The concrete impact depends on where the unvalidated value lands, which is why records in this class range from cosmetic bugs to full compromise. For Spectra Legacy the fix is 2.20.0: builds < 2.20.0 are affected, anything from 2.20.0 onward is not.

Remediation

Update to version 2.20.0, or a newer patched version

How does WordSec protect against this?

An attacker needs Contributor access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Spectra Legacy 2.20.0 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-10827 https://www.wordfence.com/threat-intel/vulnerabilities/id/959608e2-7745-403c-953e-4b5d73062f47 https://nvd.nist.gov/vuln/detail/CVE-2026-10827

Related records

Same weakness class

6.5CVE-2023-23735: Spectra HTML Injection in EmailsCVE-2023-23735

Other vulnerabilities in Spectra Legacy – Gutenberg Blocks

CVSS Vector

4.3

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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