CVE-2026-28083Network attack vector

Contributor-level stored cross-site scripting

Published Feb 26, 2026 · Updated Feb 26, 2026

Stored cross-site scripting in UX Themes Flatsome 3.20.5 and earlier allows remote authenticated users to inject scripts into site pages. Patchstack has not disclosed the vulnerable field or exact neutralization failure, but it states that injected scripts remain in site content. Contributor access is required, and the payload executes in a guest's browser only after the stored content is viewed, enabling attacker-controlled page behavior.

CVSS severity6.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in UX Themes Flatsome 3.20.5 and earlier allows remote authenticated users to inject scripts into site pages. Patchstack has not disclosed the vulnerable field or exact neutralization failure, but it states that injected scripts remain in site content. Contributor access is required, and the payload executes in a guest's browser only after the stored content is viewed, enabling attacker-controlled page behavior.

The record

CVE
CVE-2026-28083
Published
Feb 26, 2026
Updated
Feb 26, 2026
Vendor
UX Themes
Product
Flatsome
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 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=n/a <=<= 3.20.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

UX Themes · Flatsomeversion=n/a <=<= 3.20.1

Published CVSS scores

6.5PatchstackCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L

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 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')
CAPEC-592Stored XSS
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

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Your stack

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