How severe is CVE-2021-33348?

CVE-2021-33348 has a CVSS score of 6.1/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2021-33348?

CVE-2021-33348 affects the following packages: com.jfinal:jfinal (Maven). Ecosystems affected: Maven.

How do I fix CVE-2021-33348?

Update com.jfinal:jfinal to 4.9.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-33348 is resolved across your whole dependency graph.

How do I detect CVE-2021-33348 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.jfinal:jfinal, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2021-33348 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2021-33348 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2021-33348, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2021-33348?

CVE-2021-33348 has an EPSS (Exploit Prediction Scoring System) score of 0.6%, placing it in the 49th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2021-33348?

CVE-2021-33348 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2021-33348 published, and has it been updated?

CVE-2021-33348 was published on June 24, 2021 and was last updated on July 9, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

MEDIUM severity

CVE-2021-33348 — jfinal

MEDIUM

CVE-2021-33348 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in com.jfinal:jfinal. 1 public exploit reference exists, so weaponization risk is real. A fix is available for com.jfinal:jfinal — see the affected versions and patch details below.

Cross-site scripting in jfinal

Also known asGHSA-2c25-xfpq-8w9r

Published

Jun 24, 2021

Updated

Jul 9, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

1 known

Exploitation data as of Sep 28, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.6%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs49th percentile — riskier than 49% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-33348 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

☕com.jfinal:jfinal

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

An issue was discovered in JFinal framework v4.9.10 and below. The "set" method of the "Controller" class of jfinal framework is not strictly filtered, which will lead to XSS vulnerabilities in some cases.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`com.jfinal:jfinal`	all versions	4.9.11`com.jfinal:jfinal:4.9.11`

Affected Products

1 product · 1 configurations

Application

jfinaljfinal

≤ 4.9.10

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

An issue was discovered in JFinal framework v4.9.10 and below. The "set"…

github.comNVDJun 2021

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.jfinal:jfinal, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update com.jfinal:jfinal to 4.9.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-33348 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2021-33348 in your dependencies?

Find it across Maven, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.1/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No known public exploit tooling found.

OpenSSF Scorecard

Package health score

jfinal

3.5/10

Code-Review0/10

Maintained10/10

Branch-Protection0/10

Assessed Sep 28, 2026

Timeline

Disclosed

Jun 24, 2021

First exploit

Jun 30, 2021

6 days after disclosure — rapid exploitation

Last updated

Jul 9, 2026

Identifiers

CVE-2021-33348

GHSA-2c25-xfpq-8w9r

References

Advisorynvd.nist.gov Reportgithub.com

Related vulnerabilities

This CVE is medium severity, in line with the other 8 CVEs affecting jfinal.

CVE-2024-22497CVE-2024-22496CVE-2024-22493CVE-2024-22492CVE-2023-50100CVE-2023-50101CVE-2023-50102CVE-2023-50137

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedJul 9, 2026