CVE-2021-24229

CRITICALNVD 9.69.6—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.6 under NVD CVSS v3. EPSS exploit probability: 1.8%, top 24% 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
9.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.6Exploit: None knownExposed: 0

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

The Jetpack Scan team identified a Reflected Cross-Site Scripting via the patreon_save_attachment_patreon_level AJAX action of the Patreon WordPress plugin before 1.7.2. This AJAX hook is used to update the pledge level required by Patreon subscribers to access a given attachment. This action is accessible for user accounts with the ‘manage_options’ privilege (i.e.., only administrators). Unfortunately, one of the parameters used in this AJAX endpoint is not sanitized before being printed back to the user, so the risk it represents is the same as the previous XSS vulnerability.

CVSS v3
9.6
EG Score
9.6(medium)
EG Risk
48(Track)
EG Risk 48/100SSVC: 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
Severity96% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
76%
KEV
Not listed

Published

April 12, 2021

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Aug 17, 2026
No patch confirmed yet.
generic

Patreon WordPress < 1.7.2 – Reflected XSS on patreon_save_attachment_patreon_level AJAX action | CVE 2021-24229 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/001755c4-add3-4566-a022-ab1f83546c1f
generic

Vulnerabilities Found in Patreon WordPress plugin

https://jetpack.com/2021/03/26/vulnerabilities-found-in-patreon-wordpress-plugin/

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 30× 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 125 total refreshes for this CVE.

  1. 2026-08-20 22:52 UTCEPSS rescore
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  1. 2026-07-24 14:15 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2021-24229?
CVE-2021-24229 is a critical vulnerability published on April 12, 2021. The Jetpack Scan team identified a Reflected Cross-Site Scripting via the patreonsaveattachmentpatreonlevel AJAX action of the Patreon WordPress plugin before 1.7.2. This AJAX hook is used to update the pledge level required by Patreon subscribers to access a given attachment. This action is…
When was CVE-2021-24229 disclosed?
CVE-2021-24229 was first published in the National Vulnerability Database on April 12, 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-2021-24229 actively exploited?
CVE-2021-24229 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 23.8% of all scored CVEs.
What is the CVSS score of CVE-2021-24229?
CVE-2021-24229 has a CVSS v3 base score of 9.6 (NVD).
How do I remediate CVE-2021-24229?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-24229, 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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