CVE-2019-17490: app\modules\polygon\controllers\ProblemController in Jiangnan Online Judge (aka jnoj) 0.8.0 allows arbitrary f

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HIGH 8.8DOWNGRADE

CVE-2019-17490 is a high-severity flaw (CVSS 8.8) affecting jiangnan online judge. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

app\modules\polygon\controllers\ProblemController in Jiangnan Online Judge (aka jnoj) 0.8.0 allows arbitrary file upload, as demonstrated by PHP code (with a .php filename but the image/png content type) to the web/polygon/problem/tests URI.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-434
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-2019-17490?

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

Is CVE-2019-17490 being exploited?

CVE-2019-17490 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-2019-17490 affect?

CVE-2019-17490 affects jiangnan online judge. Severity is high (CVSS 8.8). app\modules\polygon\controllers\ProblemController in Jiangnan Online Judge (aka jnoj) 0.8.0 allows arbitrary file upload, as demonstrated by PHP code (with a .php filename but the image/png content type) to the web/polygon/problem/tests URI

How urgent is CVE-2019-17490?

Priority 54/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

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-2019-17493 MEDIUM 6.1 DOWNGRADE Jiangnan Online Judge (aka jnoj) 0.8.0 has XSS via the Problem[sample_input] parameter to web/admin/problem/cr
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-2019-17489 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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