CVE-2020-10387: Path Traversal in admin/download.php in Chadha PHPKB Standard Multi-Language 9 allows remote attackers to down

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MEDIUM 4.9DOWNGRADE

CVE-2020-10387 is a medium-severity flaw (CVSS 4.9) affecting phpkb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Path Traversal in admin/download.php in Chadha PHPKB Standard Multi-Language 9 allows remote attackers to download files from the server using a dot-dot-slash sequence (../) via the GET parameter file.

Why this priority

EPSS top 5%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	4.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	7.8% (top 5%)
CISA exploited list	No
Weakness	CWE-22
Published	2020-03-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: chadhaajay

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

Am I affected?

Timeline

2020-03-12 14:15 UTCPublished CVE record published
2026-06-17 02:47 UTCUpdated Record last modified

chadhaajay phpkb DOWNGRADE

Affected: 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0

1. Check installed version

apt-cache policy phpkb || rpm -q phpkb || phpkb --version

2. No fixed release: DOWNGRADE to a release before 9.0 (Debian / Ubuntu)

apt-cache madison phpkb sudo apt install phpkb=<VERSION_BEFORE_9.0> sudo apt-mark hold phpkb

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

dnf --showduplicates list phpkb sudo dnf downgrade phpkb-<VERSION_BEFORE_9.0> sudo dnf versionlock add phpkb

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: PHPKB Multi-Language 9 - Authenticated Directory Traversal

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-2020-10387?

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

Is CVE-2020-10387 being exploited?

CVE-2020-10387 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-2020-10387 affect?

CVE-2020-10387 affects phpkb. Severity is medium (CVSS 4.9). Path Traversal in admin/download.php in Chadha PHPKB Standard Multi-Language 9 allows remote attackers to download files from the server using a dot-dot-slash sequence (../) via the GET parameter file.

How urgent is CVE-2020-10387?

Priority 46/100. EPSS top 5%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

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References

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