CVE Explorer
CVE-2026-23873
hustoj is an open source online judge based on PHP/C++/MySQL/Linux for ACM/ICPC and NOIP training. All versions are vulnerable to CSV Injection (Formula Injection) through the contest rank export functionality (contestrank.xls.php and admin/ranklist_export.php). The application fails to sanitize user-supplied input (specifically the "Nickname" field) before exporting it to an .xls file (which renders as an HTML table but is opened by Excel). If a malicious user sets their nickname to an Excel fo
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"hustoj","vendor":"zhblue","versions":[{"status":"affected","version":"<= 26.01.01"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:46c265adcf753105e9c72ce940ac16328eca83c3624236820807c23ccc396f78 · sha256:cb09006988f78809… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":5.2,"baseSeverity":"MEDIUM","privilegesRequired":"LOW","subAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"ACTIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:46c265adcf753105e9c72ce940ac16328eca83c3624236820807c23ccc396f78 · sha256:cb09006988f78809… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-1236","description":"CWE-1236: Improper Neutralization of Formula Elements in a CSV File","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:46c265adcf753105e9c72ce940ac16328eca83c3624236820807c23ccc396f78 · sha256:cb09006988f78809… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"name":"https://github.com/zhblue/hustoj/security/advisories/GHSA-gqwv-v7vx-2qjw","tags":["x_refsource_CONFIRM"],"url":"https://github.com/zhblue/hustoj/security/advisories/GHSA-gqwv-v7vx-2qjw"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:46c265adcf753105e9c72ce940ac16328eca83c3624236820807c23ccc396f78 · sha256:cb09006988f78809… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.