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MEDIUM severity

CVE-2021-45328 — gitea

MEDIUM

CVE-2021-45328 is a medium-severity (CVSS 6.1) Open Redirect vulnerability in github.com/go-gitea/gitea. A fix is available for github.com/go-gitea/gitea — see the affected versions and patch details below.

Open redirect in Gitea

Also known asBIT-gitea-2021-45328GHSA-36h2-95gj-w488GO-2022-0579
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.9%probability of exploitation in next 30 days
Lower Risk-0.01%
Lower risk than most CVEs60th percentile — riskier than 60% of all scored CVEsHighest risk
0.00%0.58%1.16%1.75%0.2%0.9%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-45328 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐹github.com/go-gitea/gitea

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Gitea before 1.4.3 is affected by URL Redirection to Untrusted Site ('Open Redirect') via internal URLs.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/go-gitea/giteaall versions1.4.3go get github.com/go-gitea/gitea@v1.4.3

Affected Products

1 product · 1 configurations
Application
giteagitea
< 1.4.3
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/go-gitea/gitea, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/go-gitea/gitea to 1.4.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-45328 is resolved across your whole dependency graph.

  3. Workarounds

    Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.

How to detect CVE-2021-45328

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id cve-2021-45328 -u https://target
Template
Gitea < 1.4.3 - Open Redirect
Severity
medium
Impact
An attacker can exploit this vulnerability to redirect users to malicious websites, leading to phishing attacks or the theft of sensitive information.
Remediation
Upgrade Gitea to version 1.4.3 or later to fix the open redirect vulnerability.

Template by ProjectDiscovery nuclei-templates (ritikchaddha), MIT licensed. View the full template. Scan only systems you are authorised to test.

Frequently Asked Questions

Gitea before 1.4.3 is affected by URL Redirection to Untrusted Site ('Open Redirect') via internal URLs.
O3 Security · Impact-Aware SCA

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CVE-2021-45328: gitea Open Redirect — Fixed in 1.4.3