What is CVE-2021-28378?

CVE-2021-28378 is a low-severity vulnerability in Gitea, classified under Cross-site Scripting. CVSS score: 3.7/10. Published 2021-03-15.

How severe is CVE-2021-28378?

Low severity. CVSS v3 base score is 3.7 out of 10.

Is CVE-2021-28378 known to be exploited?

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

XSS in Gitea

CVE-2021-28378

Gitea 1.12.x and 1.13.x before 1.13.4 allows XSS via certain issue data in some situations.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-03-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.088 (95.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 95.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.088 · newest: 0.088 · change: 0.000

Affected products

Gitea

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

github.com/go-gitea/gitea/pull/14898 (Patch, Third Party Advisory)
blog.gitea.io/2021/03/gitea-1.13.4-is-released/ (Release Notes, Vendor Advisory)
github.com/PandatiX/CVE-2021-28378 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-28378?: CVE-2021-28378 is a low-severity vulnerability in Gitea, classified under Cross-site Scripting. CVSS score: 3.7/10. Published 2021-03-15.
How severe is CVE-2021-28378?: Low severity. CVSS v3 base score is 3.7 out of 10.
Is CVE-2021-28378 known to be exploited?: 8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.