CVE-2026-52816

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Source
https://cve.org/CVERecord?id=CVE-2026-52816
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52816.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-52816
Aliases
Downstream
Related
Published
2026-06-24T20:26:34.151Z
Modified
2026-08-04T11:50:33.676494235Z
Severity
  • 5.4 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:P CVSS Calculator
Summary
Gogs: Unauthenticated Jupyter Notebook (ipynb) Sanitizer allows arbitrary data: URIs leading to XSS
Details

Gogs is an open source self-hosted Git service. Prior to 0.14.3, the Jupyter Notebook (ipynb) sanitizer endpoint at POST /-/api/sanitize_ipynb allows arbitrary data: URIs without proper restrictions, potentially leading to Cross-Site Scripting (XSS). The endpoint uses bluemonday.UGCPolicy() with p.AllowURLSchemes("data") which permits all data URI schemes including data:text/html, enabling attackers to inject malicious HTML/JavaScript. Additionally, the endpoint has no authentication middleware, allowing any registered user to exploit this vulnerability. This vulnerability is fixed in 0.14.3.

Database specific 
{
    "cwe_ids": [
        "CWE-80"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52816.json"
}
References

Affected packages

Git / github.com/gogs/gogs

Affected ranges

Type
GIT
Repo
https://github.com/gogs/gogs
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
3ba8aca90e17e5410b7e8b227c9f29256ac3e875
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.14.3"
        }
    ]
}

Affected versions

v0.*
v0.10
v0.10.18
v0.10.8
v0.10rc
v0.11
v0.11.19
v0.11.29
v0.11.33
v0.11.34
v0.11.4
v0.11.43
v0.11.53
v0.11.66
v0.11.79
v0.11.86
v0.11.91
v0.11rc
v0.14.0
v0.14.0-rc.1
v0.14.1
v0.14.1-rc.1
v0.14.2
v0.14.2-rc.1
v0.2.0
v0.3.0
v0.3.1
v0.4.0
v0.4.1
v0.4.2
v0.5.0
v0.5.11
v0.5.13
v0.5.2
v0.5.5
v0.5.8
v0.5.9
v0.6.1
v0.6.15
v0.6.3
v0.6.9
v0.7.0
v0.7.19
v0.7.22
v0.7.33
v0.7.6
v0.8.0
v0.8.10
v0.8.25
v0.8.43
v0.9.0
v0.9.113
v0.9.128
v0.9.13
v0.9.141
v0.9.46
v0.9.48
v0.9.60
v0.9.71
v0.9.97

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52816.json"