CVE-2020-15228: In the `@actions/core` npm module before version 1.2.6,`addPath` and `exportVariable` functions communicate wi

Routine

LOW 3.5UPGRADE

CVE-2020-15228 is a low-severity flaw (CVSS 3.5) affecting toolkit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In the `@actions/core` npm module before version 1.2.6,`addPath` and `exportVariable` functions communicate with the Actions Runner over stdout by generating a string in a specific format. Workflows that log untrusted data to stdout may invoke these commands, resulting in the path or environment variables being modified without the intention of the workflow or action author. The runner will release an update that disables the `set-env` and `add-p

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	3.5 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-20, CWE-77
Published	2020-10-01
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: toolkit project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-10-01 18:15 UTCPublished CVE record published
2026-06-17 02:56 UTCUpdated Record last modified

toolkit project toolkit UPGRADE

Affected: < 1.2.6

Fixed in: 1.2.6

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls toolkit

2. UPGRADE to 1.2.6

npm install toolkit@">=1.2.6"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-15228?

toolkit: upgrade to 1.2.6. Exact commands for each OS are on this page.

Is CVE-2020-15228 being exploited?

CVE-2020-15228 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-15228 affect?

CVE-2020-15228 affects toolkit. Severity is low (CVSS 3.5). In the `@actions/core` npm module before version 1.2.6,`addPath` and `exportVariable` functions communicate with the Actions Runner over stdout by generating a string in a specific format. Workflows that log untrusted data to stdout may inv

How urgent is CVE-2020-15228?

Priority 36/100. Public exploit reference

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References

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