CVE-2026-58502High· 7.1▾ MidnightPoC available

githubtoplanguages generates a user's top GitHub languages as an SVG

▾ Midnight zone — Critical, or high with PoC / in-the-wild

Depth score51/ 100 · Moderate

impact 39.1 · likelihood 0.1 · exploitation 12

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

A public proof-of-concept already exists for this vulnerability — see Exploit availability below.

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Published

Sep 15, 2026

Updated

Sep 17, 2026

CVSS

7.1

Vendor

gouef

Product

githubtoplanguages

CWE

CWE-78

Depth score

51 · Moderate

EPSS

0.30% · p23

Platforms

—

Source

NVD

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

CISA SSVC

decided 2026-09-17

Exploitation: poc
Automatable: no
Technical impact: total

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.

EPSS history

Exploit-prediction probability, daily snapshots since Sep 17.

0.3% → 0.3%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

4 events · 3 days

Sep 15, 2026Published
Disclosed via NVD
Sep 17, 2026Record revised
Last analysed / modified upstream
Sep 17, 2026EPSS first tracked
0.3%
Sep 17, 2026Public exploit observed
Exploit / PoC code exists

gouef CWE-78 #nvd #cve.org #exploit-available

Affected

githubtoplanguages < 6bf9c3a9cb66c937b9047ca266b3d02f2bb11027

Full technical detail▾

Overview

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.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Change history

Field changes observed since this record was first indexed.

Sep 17, 2026Public exploit / PoC published

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org#exploit-available

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