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Gogs XSS allowed by stored call in PDF renderer

Moderate severity GitHub Reviewed Published Jun 24, 2025 in gogs/gogs • Updated Jun 26, 2025

Package

gomod github.com/gogs/gogs (Go)

Affected versions

< 0.13.3-0.20250608224432-110117b2e5e5

Patched versions

0.13.3-0.20250608224432-110117b2e5e5

Description

Summary

A stored XSS is present in Gogs which allows client-side Javascript code execution.

Details

Gogs Version:

docker images
REPOSITORY   TAG       IMAGE ID       CREATED        SIZE
gogs/gogs    latest    fe92583bc4fe   10 hours ago   99.3MB

Application version: 0.14.0+dev

Local setup using:

# Pull image from Docker Hub.
docker pull gogs/gogs

# Create local directory for volume.
sudo mkdir -p /var/gogs

# Use `docker run` for the first time.
docker run --name=gogs -p 10022:22 -p 10880:3000 -v /var/gogs:/data gogs/gogs

The vulnerability is caused by the usage of a vulnerable and outdated component: pdfjs-1.4.20 under public/plugins/.
Read more about this vulnerability at codeanlabs - CVE-2024-4367.

PoC

  1. Upload the Proof of Concept file hosted at https://codeanlabs.com/wp-content/uploads/2024/05/poc_generalized_CVE-2024-4367.pdf in a repository.
  2. Click on the file to be previewed.

poc

Credits

Edoardo Ottavianelli

References

@unknwon unknwon published to gogs/gogs Jun 24, 2025
Published by the National Vulnerability Database Jun 24, 2025
Published to the GitHub Advisory Database Jun 26, 2025
Reviewed Jun 26, 2025
Last updated Jun 26, 2025

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(8th percentile)

Weaknesses

CVE ID

CVE-2025-47943

GHSA ID

GHSA-xh32-cx6c-cp4v

Source code

Credits

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