How severe is CVE-2021-45329?

CVE-2021-45329 has a CVSS score of 6.1/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2021-45329?

CVE-2021-45329 affects the following packages: github.com/go-gitea/gitea (Go). Ecosystems affected: Go.

How do I fix CVE-2021-45329?

Update github.com/go-gitea/gitea to 1.5.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-45329 is resolved across your whole dependency graph.

How do I detect CVE-2021-45329 in my Go dependencies?

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.

How do I mitigate CVE-2021-45329 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2021-45329 actively exploited in the wild?

No public exploit code has been indexed for CVE-2021-45329 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2021-45329?

CVE-2021-45329 has an EPSS (Exploit Prediction Scoring System) score of 0.8%, placing it in the 55th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2021-45329?

CVE-2021-45329 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2021-45329 published, and has it been updated?

CVE-2021-45329 was published on February 8, 2022 and was last updated on August 7, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹

🐹 Go

Not in CISA KEV

MEDIUM severity

CVE-2021-45329 — gitea

MEDIUMFix: go-gitea/gitea#4710

CVE-2021-45329 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) 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.

Cross-site Scripting in Gitea

Also known asBIT-gitea-2021-45329GHSA-r3gq-wxqf-q4ghGO-2022-0314

Published

Feb 8, 2022

Updated

Aug 7, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Oct 12, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.8%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs55th percentile — riskier than 55% of all scored CVEsHighest risk

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

How urgent is this, really

CVE-2021-45329 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 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

Cross Site Scripting (XSS) vulnerability exists in Gitea before 1.5.1 via the repository settings inside the external wiki/issue tracker URL field.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/go-gitea/gitea`	all versions	1.5.1`go get github.com/go-gitea/gitea@v1.5.1`

Affected Products

1 product · 1 configurations

Application

giteagitea

< 1.5.1

range

Detection & mitigation playbook

Open-source dependency

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.
Fix
Update github.com/go-gitea/gitea to 1.5.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-45329 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

Cross Site Scripting (XSS) vulnerability exists in Gitea before 1.5.1 via the repository settings inside the external wiki/issue tracker URL field.

O3 Security · Impact-Aware SCA

Is CVE-2021-45329 in your dependencies?

Find it across Go, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.1/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No known public exploit tooling found.

OpenSSF Scorecard

Package health score

gitea

7.1/10

Maintained10/10

Code-Review9/10

Branch-Protection3/10

Assessed Oct 12, 2026

Timeline

Disclosed

Feb 8, 2022

Last updated

Aug 7, 2026

Identifiers

CVE-2021-45329

GHSA-r3gq-wxqf-q4gh

BIT-gitea-2021-45329

GO-2022-0314

References

Advisoryblog.gitea.io Advisorynvd.nist.gov Fixgithub.com Webblog.gitea.io Packagegithub.com

Related vulnerabilities

This CVE is medium severity; 6 of 8 other CVEs affecting gitea are rated as high or higher (top: moderate).

CVE-2026-25779CVE-2026-20800CVE-2026-20897CVE-2026-20912CVE-2026-20888CVE-2026-20883CVE-2026-20904CVE-2026-20750

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedAug 7, 2026