What is CVE-2023-2021?

CVE-2023-2021 is a medium-severity vulnerability in Nilsteampassnet Nilsteampassnet/teampass, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-04-13.

How severe is CVE-2023-2021?

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

Is CVE-2023-2021 known to be exploited?

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

XSS in Nilsteampassnet Nilsteampassnet/teampass

CVE-2023-2021

Cross-site Scripting (XSS) - Stored in GitHub repository nilsteampassnet/teampass prior to 3.0.3.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-04-13 · 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: 0.004 (27.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Nilsteampassnet Nilsteampassnet/teampass — versions unspecified
Teampass

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

tht1997/tht1997

References

huntr.dev/bounties/2e31082d-7aeb-46ff-84d6-9561758e3bf0 (Exploit, Patch)
github.com/nilsteampassnet/teampass/commit/77c541a0151841d1f4ceb0a84ca391e1b526… (Patch)

Frequently asked questions

What is CVE-2023-2021?: CVE-2023-2021 is a medium-severity vulnerability in Nilsteampassnet Nilsteampassnet/teampass, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-04-13.
How severe is CVE-2023-2021?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2023-2021 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.