CVE-2026-3534Network attack vector

Contributor-level stored XSS via background post metadata

Published Mar 11, 2026 · Updated Mar 11, 2026

Stored XSS in Brainstorm Force Astra 4.12.3 and earlier allows remote authenticated users to inject scripts through background post metadata. The ast-page-background-meta and ast-content-background-meta registrations do not sanitize four CSS properties, and astra_get_responsive_background_obj() emits them without output escaping. Contributor-level access is required to save the metadata; the injected script then runs in the browser of any user who opens the affected page.

CVSS severity6.4
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Brainstorm Force Astra 4.12.3 and earlier allows remote authenticated users to inject scripts through background post metadata. The ast-page-background-meta and ast-content-background-meta registrations do not sanitize four CSS properties, and astra_get_responsive_background_obj() emits them without output escaping. Contributor-level access is required to save the metadata; the injected script then runs in the browser of any user who opens the affected page.

The record

CVE
CVE-2026-3534
Published
Mar 11, 2026
Updated
Mar 11, 2026
Vendor
Presto Made, Inc.
Product
Astra
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=* <=4.12.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Presto Made, Inc. · Astraversion=* <=4.12.3

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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