CVE-2021-32724

CRITICALNVD 9.99.9—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.9 under NVD CVSS v3. EPSS exploit probability: 2.3%, top 18% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
9.9
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.9Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

check-spelling is a github action which provides CI spell checking. In affected versions and for a repository with the check-spelling action enabled that triggers on pull_request_target (or schedule), an attacker can send a crafted Pull Request that causes a GITHUB_TOKEN to be exposed. With the GITHUB_TOKEN, it's possible to push commits to the repository bypassing standard approval processes. Commits to the repository could then steal any/all secrets available to the repository. As a workaround users may can either: Disable the workflow until you've fixed all branches or Set repository to Allow specific actions. check-spelling isn't a verified creator and it certainly won't be anytime soon. You could then explicitly add other actions that your repository uses. Set repository Workflow permissions to Read repository contents permission. Workflows using check-spelling/check-spelling@main will get the fix automatically. Workflows using a pinned sha or tagged version will need to change the affected workflows for all repository branches to the latest version. Users can verify who and which Pull Requests have been running the action by looking up the spelling.yml action in the Actions tab of their repositories, e.g., https://github.com/check-spelling/check-spelling/actions/workflows/spelling.yml - you can filter PRs by adding ?query=event%3Apull_request_target, e.g., https://github.com/check-spelling/check-spelling/actions/workflows/spelling.yml?query=event%3Apull_request_target.

CVSS v3
9.9
EG Score
9.9(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity99% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
81.8%
KEV
Not listed

Published

September 9, 2021

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Jul 21, 2026
Patch available. Sources: github, github_commit.
github Patch Available

check-spelling workflow vulnerable to GITHUB_TOKEN leakage via symlink attack · Advisory · check-spelling/check-spelling · GitHub

https://github.com/check-spelling/check-spelling/security/advisories/GHSA-g86g-chm8-7r2p
github_commit Patch Available

commit 436362fc6b58 (check-spelling/check-spelling)

Patch available: check-spelling/check-spelling v0.0.19 (contains commit 436362fc6b58)

https://github.com/check-spelling/check-spelling/commit/436362fc6b588d9d561cbdb575260ca593c8dc56

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 17× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 102 total refreshes for this CVE.

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Frequently asked(5)

What is CVE-2021-32724?
CVE-2021-32724 is a critical vulnerability published on September 9, 2021. check-spelling is a github action which provides CI spell checking. In affected versions and for a repository with the check-spelling action enabled that triggers on pullrequesttarget (or schedule), an attacker can send a crafted Pull Request that causes a GITHUBTOKEN to be exposed. With the…
When was CVE-2021-32724 disclosed?
CVE-2021-32724 was first published in the National Vulnerability Database on September 9, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-32724 actively exploited?
CVE-2021-32724 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 81.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-32724?
CVE-2021-32724 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2021-32724?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-32724, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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