CVE-2020-36656Public exploitNetwork attack vector

Contributor-level stored XSS via unsanitized style attribute

Published Feb 21, 2023 · Updated Apr 23, 2025

Stored XSS in Spectra before 1.15.0 allows remote authenticated users with Contributor access to execute scripts through Gutenberg blocks. The Contact Form 7 Styler block copies its Additional CSS Classes value into a style-related HTML attribute without sanitizing injected attributes. Exploitation requires Contact Form 7, crafted block content, and a victim who interacts with the rendered page; resulting scripts run in that victim's browser.

CVSS severity5.4
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Spectra before 1.15.0 allows remote authenticated users with Contributor access to execute scripts through Gutenberg blocks. The Contact Form 7 Styler block copies its Additional CSS Classes value into a style-related HTML attribute without sanitizing injected attributes. Exploitation requires Contact Form 7, crafted block content, and a victim who interacts with the rendered page; resulting scripts run in that victim's browser.

The record

CVE
CVE-2020-36656
Published
Feb 21, 2023
Updated
Apr 23, 2025
Vendor
Presto Made, Inc.
Product
Spectra Legacy
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.15.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Presto Made, Inc. · Spectra Legacyversion=0 <1.15.0

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo