CVE-2021-47906Public exploitNetwork attack vector

Authenticated stored XSS via unsanitized article text

Published Jan 23, 2026 · Updated Jan 23, 2026

Stored XSS in bloofoxCMS 0.5.1.0 through 0.5.2.1 allows remote authenticated users to run scripts via an article's text field. In admin/include/inc_content_articles.php, the new-article path passes POST text through replace_specialchars(), which does not strip or encode HTML, before inserting it into sys_content. An account with article-writing permission can persist browser-executed markup that runs when another user opens the affected article, exposing non-HttpOnly cookies.

CVSS severity5.1
Medium
EPSS probability0.21%
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 bloofoxCMS 0.5.1.0 through 0.5.2.1 allows remote authenticated users to run scripts via an article's text field. In admin/include/inc_content_articles.php, the new-article path passes POST text through replace_specialchars(), which does not strip or encode HTML, before inserting it into sys_content. An account with article-writing permission can persist browser-executed markup that runs when another user opens the affected article, exposing non-HttpOnly cookies.

The record

CVE
CVE-2021-47906
Published
Jan 23, 2026
Updated
Jan 23, 2026
Vendor
Bloofox
Product
bloofoxCMS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 23, 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=0.5.1.0 - 0.5.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Bloofox · bloofoxCMSversion=0.5.1.0 - 0.5.2.1

Published CVSS scores

6.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA: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 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 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

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Your stack

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