What is CVE-2021-3298?

CVE-2021-3298 is a medium-severity vulnerability in O-Dyn Collabtive, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-01-29.

How severe is CVE-2021-3298?

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

Is CVE-2021-3298 known to be exploited?

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

XSS in O-Dyn Collabtive

CVE-2021-3298

Collabtive 3.1 allows XSS when an authenticated user enters an XSS payload into the address section of the profile edit page, aka the manageuser.php?action=edit address1 parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-01-29 · 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: 0.021 (81.3th percentile), scored 2026-09-28.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000

Affected products

O-Dyn Collabtive — versions 3.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

collabtive.o-dyn.de/forum/viewforum.php (Vendor Advisory)
www.exploit-db.com/exploits/49468 (Exploit, VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3298?: CVE-2021-3298 is a medium-severity vulnerability in O-Dyn Collabtive, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-01-29.
How severe is CVE-2021-3298?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2021-3298 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.