CVE-2026-32986Public exploitNetwork attack vector

JavaScript execution via unescaped Atom feed fields

Published Mar 20, 2026 · Updated Mar 20, 2026

Second-order XSS in Textpattern CMS 4.9.0 allows remote attackers to execute JavaScript through a crafted Atom feed request. Atom feed generation places the user-controlled category parameter into id and link href XML elements without contextual escaping. Execution requires a feed reader or CMS aggregator to insert the resulting XML content into an HTML DOM through an unsafe method such as innerHTML, enabling script execution in that consumer's trusted context.

CVSS severity5.1
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Second-order XSS in Textpattern CMS 4.9.0 allows remote attackers to execute JavaScript through a crafted Atom feed request. Atom feed generation places the user-controlled category parameter into id and link href XML elements without contextual escaping. Execution requires a feed reader or CMS aggregator to insert the resulting XML content into an HTML DOM through an unsafe method such as innerHTML, enabling script execution in that consumer's trusted context.

The record

CVE
CVE-2026-32986
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
Textpattern
Product
Textpattern CMS
Classifications
CWE-116, CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 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=4.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Textpattern · Textpattern CMSversion=4.9.0

Published CVSS scores

6.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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