What is CVE-2021-42940?

CVE-2021-42940 is a critical-severity vulnerability in Projeqtor, classified under Cross-site Scripting. CVSS score: 9.9/10. Published 2022-02-11.

How severe is CVE-2021-42940?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Is CVE-2021-42940 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Projeqtor

CVE-2021-42940

A Cross Site Scripting (XSS) vulnerability exists in Projeqtor 9.3.1 via /projeqtor/tool/saveAttachment.php, which allows an attacker to upload a SVG file containing malicious JavaScript code.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.011 (61.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Projeqtor
N/a — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

cve@mitre.org (Product, x_refsource_MISC, Vendor Advisory)
cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-42940?: CVE-2021-42940 is a critical-severity vulnerability in Projeqtor, classified under Cross-site Scripting. CVSS score: 9.9/10. Published 2022-02-11.
How severe is CVE-2021-42940?: Critical severity. CVSS v3 base score is 9.9 out of 10.
Is CVE-2021-42940 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.