CVE-2026-63187Public exploitNetwork attack vector

Runner command execution via interpolated PR title

Published Aug 19, 2026 · Updated Aug 25, 2026

OS command injection in Logto 1.40.1 allows remote attackers to execute arbitrary commands on a GitHub Actions runner via a pull request title. The Commitlint workflow inserts github.event.pull_request.title directly into a single-quoted inline echo command, so an embedded quote ends the string and appended shell syntax runs on the GitHub Actions runner. A pull request must trigger the workflow; execution is confined to an ephemeral runner with a read-only token and no repository secrets, but injected commands can alter or disrupt that workflow run.

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

OS command injection in Logto 1.40.1 allows remote attackers to execute arbitrary commands on a GitHub Actions runner via a pull request title. The Commitlint workflow inserts github.event.pull_request.title directly into a single-quoted inline echo command, so an embedded quote ends the string and appended shell syntax runs on the GitHub Actions runner. A pull request must trigger the workflow; execution is confined to an ephemeral runner with a read-only token and no repository secrets, but injected commands can alter or disrupt that workflow run.

The record

CVE
CVE-2026-63187
Published
Aug 19, 2026
Updated
Aug 25, 2026
Vendor
Logto
Product
Logto
Classifications
CWE-94, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record 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=>= 1.40.1, < 1.41.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Logto · Logtoversion=>= 1.40.1, < 1.41.0

Published CVSS scores

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

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.004Unix Shell

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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