VulnerabilityPublished 16 Mar 2026

CVE-2026-4200: glowxq-oj · Server-Side Request Forgery

Affects glowxq-ojSource CVE Database V5

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Public exploit available · CVSS 6.9 Medium.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 4.0 base score

6.9Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 23% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: None
User Interaction: None
Vulnerable system confidentiality: Low
Vulnerable system integrity: Low
Vulnerable system availability: Low
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Threat metrics

Exploit Maturity: POC

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the Vulnerable System are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.
Exploit Maturity: POC: Based on threat intelligence sources each of the following must apply: · Proof-of-concept is publicly available · No knowledge of reported attempts to exploit this vulnerability · No knowledge of publicly available solutions used to simplify attempts to exploit the vulnerability

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 16 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
CVSS exploit maturity: proof of concept public
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CVSS vector, the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
glowxqglowxq-oj	Affected =6f7c723090472057252040fd2bbbdaa1b5ed2393	Fixed in–

AI-suggested

To mitigate CVE-2026-4200, organizations should implement strict input validation and sanitization on the uploadTestcaseZipUrl function to ensure that only trusted URLs or local resources are accepted. Employ allowlisting of domains or IP addresses to restrict outbound requests initiated by the server. Network-level controls such as egress filtering and firewall rules should be enforced to prevent the server from making unauthorized requests to internal or sensitive endpoints. Deploy web application firewalls (WAFs) with rules to detect and block SSRF attack patterns targeting this endpoint. Monitor logs for unusual outbound requests originating from the glowxq-oj server. Since the vendor has not provided patches, organizations should consider isolating the glowxq-oj service in a segmented network zone with minimal privileges and no access to sensitive internal systems. Regularly review and update dependencies and monitor for vendor updates or community patches. If possible, disable or restrict the uploadTestcaseZipUrl functionality until a secure fix is available.

Description

A security flaw has been discovered in glowxq glowxq-oj up to 6f7c723090472057252040fd2bbbdaa1b5ed2393. This affects the function uploadTestcaseZipUrl of the file business/business-oj/src/main/java/com/glowxq/oj/problem/controller/ProblemCaseController.java. Performing a manipulation results in server-side request forgery. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks. Continious delivery with rolling releases is used by this product. Therefore, no version details of affected nor updated releases are available. The vendor was contacted early about this disclosure but did not respond in any way.

Impact

The SSRF vulnerability in glowxq-oj can have significant impacts on organizations using this software. Attackers can leverage the flaw to make the server send crafted requests to internal or external systems, potentially accessing sensitive internal resources that are not directly exposed to the internet. This can lead to unauthorized information disclosure, such as internal metadata services or private APIs. Additionally, SSRF can be used as a pivot point to conduct further attacks within the internal network, including scanning, lateral movement, or exploitation of other vulnerabilities. The lack of authentication and user interaction requirements means attackers can exploit the vulnerability remotely and anonymously. Although the CVSS score is medium, the real-world impact depends on the internal network architecture and the sensitivity of accessible resources. Organizations relying on glowxq-oj for critical online judge or educational services may face service disruption, data leakage, or reputational damage if exploited.

Summary

CVE-2026-4200 is a server-side request forgery vulnerability found in the glowxq-oj software, an online judge system developed by glowxq. The vulnerability exists in the uploadTestcaseZipUrl function within the ProblemCaseController.java source file. This function improperly handles user-supplied URLs when uploading test case ZIP files, allowing an attacker to craft malicious requests that cause the server to initiate HTTP requests to arbitrary destinations. SSRF vulnerabilities can be exploited to access internal services, bypass firewalls, or exfiltrate sensitive data. The flaw is remotely exploitable without requiring authentication or user interaction, increasing its risk profile. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no privileges or user interaction needed, and limited impact on confidentiality, integrity, and availability. The vendor employs continuous delivery with rolling releases, complicating version tracking and patch management. Despite early notification, the vendor has not issued a response or patch, and public exploit code is available, which may facilitate attacks. No confirmed active exploitation has been reported yet, but the presence of public exploits elevates the threat level.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 16 Mar 2026, 08:38 UTC

Technical details

References

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