CVE-2026-31852Network attack vector

Repository takeover via untrusted pull-request workflow execution

Published Mar 11, 2026 · Updated Mar 11, 2026

Arbitrary code execution in Jellyfin's code-quality.yml workflow allows remote attackers to run forked pull-request code with repository privileges. The workflow uses pull_request_target, checks out the fork's head commit, and runs Jest while write permissions and repository secrets remain available. A crafted fork pull request therefore grants access to privileged tokens, enabling secret theft, repository takeover, and downstream release compromise.

CVSS severity10.0
Critical
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary code execution in Jellyfin's code-quality.yml workflow allows remote attackers to run forked pull-request code with repository privileges. The workflow uses pull_request_target, checks out the fork's head commit, and runs Jest while write permissions and repository secrets remain available. A crafted fork pull request therefore grants access to privileged tokens, enabling secret theft, repository takeover, and downstream release compromise.

The record

CVE
CVE-2026-31852
Published
Mar 11, 2026
Updated
Mar 11, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-269, T1195.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

10.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
T1195.001Compromise Software Dependencies and Development Tools

Public exploit references

No public exploit references are available in this record.

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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