What is CVE-2021-40261?

CVE-2021-40261 is a medium-severity vulnerability in Casap Automated Enrollment System Project, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-11-08.

How severe is CVE-2021-40261?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Casap Automated Enrollment System Project

CVE-2021-40261

Multiple Cross Site Scripting (XSS) vulnerabilities exist in SourceCodester CASAP Automated Enrollment System 1.0 via the (1) user_username and (2) category parameters in save_class.php, the (3) firstname, (4) class, and (5) status parameters in student_table.php, the (6) category and (7) class_name parameters in add_class1.php, the (8) fname, (9) mname,(10) lname, (11) address, (12) class, (13) gfname, (14) gmname, (15) glname, (16) rship, (17) status, (18) transport, and (19) route parameters in add_student.php, the (20) fname, (21) mname, (22) lname, (23) address, (24) class, (25) fgname, (26) gmname, (27) glname, (28) rship, (29) status, (30) transport, and (31) route parameters in save_stud.php,the (32) status, (33) fname, and (34) lname parameters in add_user.php, the (35) username, (36) firstname, and (37) status parameters in users.php, the (38) fname, (39) lname, and (40) status parameters in save_user.php, and the (41) activity_log, (42) aprjun, (43) class, (44) janmar, (45) Julsep,(46) octdec, (47) Students and (48) users parameters in table_name.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-11-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (49.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.007 · change: +0.000

Affected products

Casap Automated Enrollment System Project — versions 1.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

sisl.lab.uic.edu/projects/chess/casap-automated-enrollment-system/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-40261?: CVE-2021-40261 is a medium-severity vulnerability in Casap Automated Enrollment System Project, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-11-08.
How severe is CVE-2021-40261?: Medium severity. CVSS v3 base score is 6.1 out of 10.