Vulnerability · Published Sep 15, 2026 · Assigned by GitHub_M
CVE-2026-58502githubtoplanguages: Command Injection via Issue Title in Discord Notification Workflow
High 7.1
In plain English
A high-severity OS command injection in githubtoplanguages from gouef. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities).
Official description
githubtoplanguages generates a user's top GitHub languages as an SVG. The .github/workflows/discord-issue.yml workflow runs when an issue is opened or closed and interpolates github.event.issue.title directly into the Bash assignment for ISSUE_TITLE before shell parsing. An issue title containing shell command-substitution syntax can therefore execute commands on the GitHub Actions runner before the title is included in the Discord notification sent through DISCORD_WEBHOOK. Successful exploitation can manipulate or spoof trusted bot notifications and may expose the Discord webhook secret or other workflow environment data, depending on repository permissions. This issue is fixed by commit 6bf9c3a9cb66c937b9047ca266b3d02f2bb11027.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| gouef | githubtoplanguages | < 6bf9c3a9cb66c937b9047ca266b3d02f2bb11027 |
Weakness: CWE-78 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N