What is CVE-2023-28873?

CVE-2023-28873 is a medium-severity vulnerability in Seafile, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-12-09.

How severe is CVE-2023-28873?

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

Is CVE-2023-28873 known to be exploited?

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

XSS in Seafile

CVE-2023-28873

An XSS issue in wiki and discussion pages in Seafile 9.0.6 allows attackers to inject JavaScript into the Markdown editor.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-12-09 · 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 (36.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.3% 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

Seafile — versions 9.0.6

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

herolab.usd.de/en/security-advisories/usd-2022-0032/ (Exploit, Third Party Advisory)
manual.seafile.com/changelog/server-changelog/ (Release Notes)

Frequently asked questions

What is CVE-2023-28873?: CVE-2023-28873 is a medium-severity vulnerability in Seafile, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-12-09.
How severe is CVE-2023-28873?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2023-28873 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.