CVE-2026-85593Public exploitNetwork attack vectorHinoki check available

Stored XSS via post-sanitization entity decoding

Published Sep 4, 2026 · Updated Sep 4, 2026

Stored XSS in phpMyFAQ 4.0.8 through 4.1.7 allows remote authenticated users to execute JavaScript in FAQ viewers' browsers. FaqHelper::convertOldInternalLinks() decodes the entire sanitized answer before rewriting legacy URLs, restoring entity-encoded tags and event handlers as active markup. Exploitation requires FAQ editing privileges, a legacy-format internal URL in the answer, and a victim who views the published FAQ page.

CVSS severity5.4
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in phpMyFAQ 4.0.8 through 4.1.7 allows remote authenticated users to execute JavaScript in FAQ viewers' browsers. FaqHelper::convertOldInternalLinks() decodes the entire sanitized answer before rewriting legacy URLs, restoring entity-encoded tags and event handlers as active markup. Exploitation requires FAQ editing privileges, a legacy-format internal URL in the answer, and a victim who views the published FAQ page.

The record

CVE
CVE-2026-85593
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
Thorsten Rinne
Product
phpMyFAQ
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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 <4.1.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Thorsten Rinne · phpMyFAQversion=0 <4.1.8

Published CVSS scores

5.4GitHubCVSS: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.

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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

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Your stack

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