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CVE-2026-52816— Gogs: Unauthenticated Jupyter Notebook (ipynb) Sanitizer allows arbitrary data: URIs leading to XSS

Quick assessment

Affected
gogs gogs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Gogs是Gogs团队开源的一个源代码管理软件。 Gogs 0.14.3之前版本存在跨站脚本漏洞，该漏洞源于Jupyter Notebook清理器端点对data: URI限制不当，可能导致跨站脚本攻击。

AI Predicted 6.1 Difficulty: Easy EPSS 0.68% · P50

Affected Version Matrix 1

VendorProduct Version RangeStatus
gogs gogs < 0.14.3 affected
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I. Basic Information for CVE-2026-52816

Vulnerability Information
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Vulnerability Title
Gogs: Unauthenticated Jupyter Notebook (ipynb) Sanitizer allows arbitrary data: URIs leading to XSS
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
Web页面中脚本相关HTML标签转义处理不恰当(基本跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Gogs 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Gogs是Gogs团队开源的一个源代码管理软件。 Gogs 0.14.3之前版本存在跨站脚本漏洞，该漏洞源于Jupyter Notebook清理器端点对data: URI限制不当，可能导致跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
gogs gogs < 0.14.3 -

II. Public POCs for CVE-2026-52816

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III. Intelligence Information for CVE-2026-52816

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Patches & Fixes for CVE-2026-52816 (2)

Vendor Advisories for CVE-2026-52816 (1)

Vendor Pages for CVE-2026-52816 (1)

Same Patch Batch · gogs · 2026-06-24 · 24 CVEs total

CVE-2026-52813 10.0 CRITICAL Gogs: Path Traversal in organization name results in RCE through Git hooks
CVE-2026-52806 9.9 CRITICAL Gogs: RCE via git rebase --exec argument injection in pull request merge
CVE-2026-52798 8.9 HIGH Gogs: Stored XSS in `.ipynb` Preview
CVE-2026-52800 8.8 HIGH Gogs: CSRF Leading to Organization Owner Takeover
CVE-2026-52805 8.7 HIGH Gogs: Migration Redirect Bypass Leads to Internal Repository Theft
CVE-2026-52797 8.5 HIGH Gogs: Overwriting critical files results in a denial of service
CVE-2026-47267 8.3 HIGH Gogs: SSRF in webhook deliveries
CVE-2026-52801 8.1 HIGH Gogs: Ability to import local repositories via Mirror Settings
CVE-2026-52799 7.5 HIGH Gogs: Missing Authorization in Attachment Download
CVE-2026-52808 7.1 HIGH Gogs: Write-level collaborators can mutate admin-only repository settings via API
CVE-2026-52809 6.8 MEDIUM Gogs: Password-reset tokens use account-activation lifetime, ignoring RESET_PASSWORD_CODE_
CVE-2026-52802 5.4 MEDIUM Gogs: Open Redirect via redirect_to in Gogs
CVE-2025-64719 4.9 MEDIUM Gogs: Denial of Service in repository/wiki file listing web pages
CVE-2026-52795 4.3 MEDIUM Gogs: Authorization Bypass in Watch API allows any user to monitor private repository acti
CVE-2026-52796 3.5 LOW Gogs: DoS in rendering issue index pattern
CVE-2026-52810 Gogs: Write to readonly repositories using receive-pack + service=git-upload-pack confusio
CVE-2026-52814 Gogs: Unauthenticated Asymmetric Denial of Service (DoS) via SSH Handshake Stall (File Des
CVE-2026-52807 Gogs: DOM-based XSS via Milestone Name on New Issue Page
CVE-2026-52812 Gogs: LFS dedupe path leaks private repo content across tenants
CVE-2026-52804 Gogs: Privilege Escalation via Collaboration Access Mode Validation

Showing top 20 of 24 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: gogs
Same vendor: gogs
Same weakness: CWE-80

V. Comments for CVE-2026-52816

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