Is CVE-2026-52798 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-52798 being exploited in the wild.

How severe is CVE-2026-52798?

High severity, with a CVSS score of 8.9, published 24 June 2026.

Which products and versions are affected?

gogs.io/gogs (Go) <= 0.14.2, SEMVER:introduced=0, SEMVER:introduced=0,fixed=0.14.3; Gogs < 0.14.3, <= 0.14.2.

Is there a fix for CVE-2026-52798?

Yes. gogs.io/gogs (Go): upgrade to 0.14.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-52798 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-52798?

Check whether you run gogs.io/gogs (Go) or Gogs at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-52798: Gogs stored XSS in Jupyter notebook preview

Q: Which products and versions are affected?

gogs.io/gogs (Go) <= 0.14.2, SEMVER:introduced=0, SEMVER:introduced=0,fixed=0.14.3; Gogs < 0.14.3, <= 0.14.2.

Q: Is there a fix for CVE-2026-52798?

Yes. gogs.io/gogs (Go): upgrade to 0.14.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-52798 attacked?

It is attacked over the network, in a web application.

Q: Am I affected by CVE-2026-52798?

Check whether you run gogs.io/gogs (Go) or Gogs at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-52798 · Severity: high · CVSS 8.9 · Published 2026-06-24

Gogs is an open-source self-hosted Git service used by developers to manage source code. A security flaw in how the platform previews Jupyter Notebook (.ipynb) files allows an attacker to embed malicious code within a file. If a user views a specially crafted notebook and clicks a link within it, the attacker can execute commands in the user's browser, potentially leading to account takeover, data theft, or unauthorized repository changes.

Technologies: gogs.io/gogs (Go), Gogs. Vendors: Go, Gogs.

Quick answers

Is CVE-2026-52798 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-52798 being exploited in the wild.
How severe is CVE-2026-52798?: High severity, with a CVSS score of 8.9, published 24 June 2026.
Which products and versions are affected?: gogs.io/gogs (Go) <= 0.14.2, SEMVER:introduced=0, SEMVER:introduced=0,fixed=0.14.3; Gogs < 0.14.3, <= 0.14.2.
Is there a fix for CVE-2026-52798?: Yes. gogs.io/gogs (Go): upgrade to 0.14.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-52798 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-52798?: Check whether you run gogs.io/gogs (Go) or Gogs at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

gogs.io/gogs (Go): upgrade to 0.14.3 or later
```
go get gogs.io/gogs@v0.14.3
```

Technical details

A Stored Cross-Site Scripting (XSS) vulnerability exists in Gogs' handling of Jupyter Notebook (.ipynb) previews. While the server-side sanitization via '/-/api/sanitize_ipynb' correctly filters initial input, the application subsequently re-renders Markdown cells on the client side using the 'marked()' library on elements with the '.nb-markdown-cell' class. This client-side re-rendering process fails to re-sanitize the content, allowing 'javascript:', 'vbscript:', or 'data:' URI schemes to be regenerated into clickable links. An attacker with repository write access can commit a malicious .ipynb file; when a victim views the file and clicks the link, arbitrary JavaScript executes within the Gogs origin. The issue was addressed in version 0.14.3 by upgrading 'marked.js' to version 4.3.0 and implementing a URL scheme blocklist.

Affected products

Gogs Gogs < 0.14.3

Identifiers

CVE-2026-52798
GHSA-jq8v-rmf6-65jw
GO-2026-5477

Timeline

2026-06-04: patched: Fix merged into main branch
2026-06-07: advisory: Release 0.14.3 published
2026-06-24: disclosed: CVE-2026-52798 published to NVD

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.