Security readout for executives and security teams
Plain-English summary
CVE-2026-24479 affects HUSTOJ before 26.01.24. A malicious ZIP uploaded to problem import features can write files outside the intended directory. If written into the web root, this can become remote code execution. Systems running public or broadly accessible HUSTOJ instances should treat this as urgent.
Executive priority
High priority for any organization operating HUSTOJ. The issue can move from a file upload/import function to server code execution. Patch or restrict the affected import paths quickly, especially on internet-facing systems.
Technical view
The vulnerable modules are problem_import_qduoj.php and problem_import_hoj.php. They insufficiently sanitize filenames inside uploaded ZIP archives, allowing path traversal during extraction, commonly known as Zip Slip. The CVE lists CWE-22 and CVSS 4.0 score 9.3 with network, low-complexity, no-privilege, no-user-interaction characteristics.
Likely exposure
Exposure is likely where HUSTOJ versions before 26.01.24 allow access to the affected problem import modules. Internet-facing training or contest platforms are higher priority. The provided sources do not define default access controls for those modules.
Exploitation context
The sources describe a crafted ZIP archive causing arbitrary file write and possible RCE. CISA KEV is false in the provided data, and no cited source states active exploitation. Treat as highly exploitable based on severity and attack complexity, not confirmed in-the-wild activity.
Researcher notes
Evidence comes from the GitHub security advisory, CVE record, and linked fix commit. The description supports Zip Slip leading to arbitrary file write and RCE. Do not assume exploitation is active; the provided KEV flag is false and no source confirms exploitation.
Mitigation direction
- Upgrade HUSTOJ to version 26.01.24 or later.
- Restrict access to problem import functionality until upgraded.
- Review vendor advisory and commit for implementation details.
- Check vendor guidance for any additional hardening steps.
Validation and detection
- Inventory HUSTOJ deployments and record running versions.
- Confirm whether version is earlier than 26.01.24.
- Identify whether problem_import_qduoj.php or problem_import_hoj.php is present.
- Review recent import activity and unexpected web-root file changes.
- Verify the vendor fix is deployed after upgrade.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-24479 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.3 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
9.3CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/zhblue/hustoj/security/advisories/GHSA-xmgg-2rw4-7fxjCVE reference · x_refsource_CONFIRM
- https://github.com/zhblue/hustoj/commit/902bd09e6d0011fe89cd84d4236899314b33101fCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.