CVE-2025-47943Public exploitNetwork attack vector

Stored XSS via unsafe PDF FontMatrix compilation

Published Jun 24, 2025 · Updated Jul 30, 2025

Stored XSS in Gogs 0.14.0+dev and earlier allows remote authenticated users to execute JavaScript through a malicious PDF preview. The bundled pdf.js 1.4.20 renderer accepts nonnumeric Type 1 FontMatrix values, concatenates them into glyph-path JavaScript, and passes the result to Function. An attacker needs repository write access to store the PDF, and a victim must preview it; execution occurs in the Gogs origin and can expose browser-accessible data or alter displayed content.

CVSS severity6.3
Medium
EPSS probability0.36%
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 Gogs 0.14.0+dev and earlier allows remote authenticated users to execute JavaScript through a malicious PDF preview. The bundled pdf.js 1.4.20 renderer accepts nonnumeric Type 1 FontMatrix values, concatenates them into glyph-path JavaScript, and passes the result to Function. An attacker needs repository write access to store the PDF, and a victim must preview it; execution occurs in the Gogs origin and can expose browser-accessible data or alter displayed content.

The record

CVE
CVE-2025-47943
Published
Jun 24, 2025
Updated
Jul 30, 2025
Vendor
Gogs
Product
Gogs
Classifications
CWE-79, T1204.002, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 0.14.0+dev

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Gogs · Gogsversion=<= 0.14.0+dev

Published CVSS scores

6.3GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.002Malicious File
T1059.007JavaScript/JScript

Public exploit references

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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