What is CVE-2021-43265?

CVE-2021-43265 is a medium-severity vulnerability in Mahara, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-11-02.

How severe is CVE-2021-43265?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Mahara

CVE-2021-43265

In Mahara before 20.04.5, 20.10.3, 21.04.2, and 21.10.0, certain tag syntax could be used for XSS, such as via a SCRIPT element.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-11-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (47.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.8% 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: 0.006 · change: 0.000

Affected products

Mahara

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

bugs.launchpad.net/mahara/+bug/1944633 (Exploit, Third Party Advisory)
mahara.org/interaction/forum/topic.php (Vendor Advisory)

Frequently asked questions

What is CVE-2021-43265?: CVE-2021-43265 is a medium-severity vulnerability in Mahara, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-11-02.
How severe is CVE-2021-43265?: Medium severity. CVSS v3 base score is 5.4 out of 10.