CVE-2019-17493: Jiangnan Online Judge (aka jnoj) 0.8.0 has XSS via the Problem[sample_input] parameter to web/admin/problem/cr

This month

MEDIUM 6.1DOWNGRADE

CVE-2019-17493 is a medium-severity flaw (CVSS 6.1) affecting jiangnan online judge. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Jiangnan Online Judge (aka jnoj) 0.8.0 has XSS via the Problem[sample_input] parameter to web/admin/problem/create or web/polygon/problem/update.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-10-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jnoj

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-10-10 21:15 UTCPublished CVE record published
2026-06-17 02:23 UTCUpdated Record last modified

jnoj jiangnan online judge DOWNGRADE

Affected: 0.8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.8.0

1. Check installed version

apt-cache policy jiangnan-online-judge || rpm -q jiangnan-online-judge || jiangnan-online-judge --version

2. No fixed release: DOWNGRADE to a release before 0.8.0 (Debian / Ubuntu)

apt-cache madison jiangnan-online-judge sudo apt install jiangnan-online-judge=<VERSION_BEFORE_0.8.0> sudo apt-mark hold jiangnan-online-judge

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jiangnan-online-judge sudo dnf downgrade jiangnan-online-judge-<VERSION_BEFORE_0.8.0> sudo dnf versionlock add jiangnan-online-judge

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-17493?

jiangnan online judge: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-17493 being exploited?

CVE-2019-17493 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-17493 affect?

CVE-2019-17493 affects jiangnan online judge. Severity is medium (CVSS 6.1). Jiangnan Online Judge (aka jnoj) 0.8.0 has XSS via the Problem[sample_input] parameter to web/admin/problem/create or web/polygon/problem/update.

How urgent is CVE-2019-17493?

Priority 43/100. Public exploit reference

Related CVEs

CVE-2019-17538 HIGH 7.5 DOWNGRADE Jiangnan Online Judge (aka jnoj) 0.8.0 has Directory Traversal for file reading via the web/polygon/problem/vi
CVE-2019-17537 HIGH 7.5 DOWNGRADE Jiangnan Online Judge (aka jnoj) 0.8.0 has Directory Traversal for file deletion via the web/polygon/problem/d
CVE-2019-17491 MEDIUM 6.1 DOWNGRADE Jiangnan Online Judge (aka jnoj) 0.8.0 has XSS via the Problem[description] parameter to web/admin/problem/cre
CVE-2019-17490 HIGH 8.8 DOWNGRADE app\modules\polygon\controllers\ProblemController in Jiangnan Online Judge (aka jnoj) 0.8.0 allows arbitrary f
CVE-2019-17489 MEDIUM 6.1 DOWNGRADE Jiangnan Online Judge (aka jnoj) 0.8.0 has XSS via the Problem[title] parameter to web/polygon/problem/create

References

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