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Description

Textpattern CMS version 4.9.0 contains a second-order cross-site scripting vulnerability that allows attackers to inject malicious scripts by exploiting improper sanitization of user-supplied input in Atom feed XML elements. Attackers can embed unescaped payloads in parameters such as category that are reflected into Atom fields like and , which execute as JavaScript when feed readers or CMS aggregators consume the feed and insert content into the DOM using unsafe methods.

PUBLISHED Reserved 2026-03-17 | Published 2026-03-20 | Updated 2026-03-20 | Assigner VulnCheck




MEDIUM: 5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

MEDIUM: 6.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-116 Improper Encoding or Escaping of Output

Product status

Default status
unaffected

4.9.0
affected

Credits

indoushka finder

References

packetstorm.news/files/id/216241/ (Packet Storm listing (Textpattern 4.9.0 Second-Order XSS via Atom Feed Injection)) exploit

textpattern.com/ (Vendor site) product

cve.org (CVE-2026-32986)

nvd.nist.gov (CVE-2026-32986)

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