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Description

Discuz! X5.0 releases 20260320 through 20260610 contain a local file inclusion vulnerability that allows authenticated administrators to execute arbitrary code by importing a specially crafted plugin configuration containing path traversal sequences in the directory attribute. Attackers can trigger an exception during plugin installation to bypass sanitization routines, causing malicious paths to be stored unsanitized and subsequently passed to include(), which combined with file upload functionality escalates to arbitrary code execution in the context of the web server user.

PUBLISHED Reserved 2026-06-02 | Published 2026-06-15 | Updated 2026-06-16 | Assigner VulnCheck




HIGH: 8.6CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

HIGH: 7.2CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Problem types

Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion')

Product status

Default status
unknown

20260320 (date)
affected

Credits

Egidio Romano finder

References

seclists.org/fulldisclosure/2026/Jun/5

karmainsecurity.com/KIS-2026-11 technical-description

karmainsecurity.com/...-in-discuz-from-race-condition-to-rce exploit

www.vulncheck.com/...via-enable-disable-php-plugin-directory third-party-advisory

cve.org (CVE-2026-49954)

nvd.nist.gov (CVE-2026-49954)

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