CVE-2021-45329Network attack vector

Stored XSS via prefix-only external URL validation

Published Feb 8, 2022 · Updated Aug 4, 2024

Stored XSS in Gitea before 1.5.1 allows remote authenticated users to execute scripts in visitors' browsers via external repository URLs. The repository settings handler accepted external wiki and issue-tracker values after checking only an HTTP or HTTPS prefix, then stored them as visitor-facing links. An attacker needs permission to edit repository settings, and a visitor must follow the crafted link; script then runs in the visitor's Gitea session.

CVSS severity6.1
Medium
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Gitea before 1.5.1 allows remote authenticated users to execute scripts in visitors' browsers via external repository URLs. The repository settings handler accepted external wiki and issue-tracker values after checking only an HTTP or HTTPS prefix, then stored them as visitor-facing links. An attacker needs permission to edit repository settings, and a visitor must follow the crafted link; script then runs in the visitor's Gitea session.

The record

CVE
CVE-2021-45329
Published
Feb 8, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 8, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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