ProjeQtor < 12.4.4 Stored XSS via checkValidFileName()

published 2026-04-27 6 mo ago modified 2026-07-14 3 mo ago also EUVD-2026-25870

cvss: 5.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits: 0; none known

ProjeQtor versions 7.0 through 12.4.3 contain a stored cross-site scripting vulnerability in the file upload functionality where the checkValidFileName() function fails to restrict HTML and HTM file uploads. Authenticated attackers can upload HTML files containing arbitrary JavaScript through the image upload or attachment endpoints, and any user accessing the uploaded file URL will execute the embedded JavaScript in their browser.

Patch / fix

fixed in 1

ProjeQtor ProjeQtor 12.4.4

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 6 mo ago (2026-04-27)

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

damiri.fr https://damiri.fr/en/cves/CVE-2026-41467 referenced PoC, tagged "exploit" by a source, unverified
gryfman.fr https://gryfman.fr/cves/CVE-2026-41467 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	5.1	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CNA	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CNA	4.0	5.1	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

ProjeQtor ProjeQtor

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

damiri.fr /en/cves/CVE-2026-41467
technical-description, exploit
gryfman.fr /cves/CVE-2026-41467
technical-description, exploit
projeqtor.com
product
vulncheck.com /advisories/projeqtor-stored-xss-via-checkvalidfilename
third-party-advisory

Sources

CVE List CVE-2026-41467
NVD CVE-2026-41467

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