XSS in baserCMS before 4.1.4

published 2018-11-05 8 y ago modified 2026-09-10 1 mo ago also GHSA-fx2m-5m9v-jhgp , EUVD-2022-3847

cvss: 4.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits: 0; none known

An issue was discovered in baserCMS before 4.1.4. In the Register New Category feature of the Upload menu, the category name can be used for XSS via the data[UploaderCategory][name] parameter to an admin/uploader/uploader_categories/edit URI.

Patch / fix

fixed in 2

packagist baserproject/basercms 4.1.4
basercms basercms 4.1.4

Exploit prediction

0.73% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

sunu11.com http://sunu11.com/2018/10/31/baserCMS/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	4.8	CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	3.5	AV:N/AC:M/Au:S/C:N/I:P/A:N
GitHub	3.0	4.8	CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
packagist	baserproject/basercms	<4.1.4	4.1.4

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

sunu11.com /2018/10/31/baserCMS/
exploit, third-party-advisory
basercms.net /release/4_1_4
release-notes, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2018-18943
advisory
web.archive.org /web/20200130073341/https://basercms.net/release/4_1_4
web
web.archive.org /web/20211209034642/http://sunu11.com/2018/10/31/baserCMS
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary