CVE-2018-17826: HisiPHP 1.0.8 allows CSRF via admin.php/admin/user/adduser.html to add an administrator account

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HIGH 8.8DOWNGRADE

CVE-2018-17826 is a high-severity flaw (CVSS 8.8) affecting hisiphp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

HisiPHP 1.0.8 allows CSRF via admin.php/admin/user/adduser.html to add an administrator account. The attacker can then use that account to execute arbitrary PHP code by leveraging app/common/model/AdminAnnex.php to add .php to the default list of allowable file-upload types (.jpg, .png, .gif, .jpeg, and .ico).

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	None
User interaction	Required
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-352
Published	2018-10-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: hisiphp

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

Am I affected?

Timeline

2018-10-01 08:29 UTCPublished CVE record published
2026-06-17 01:46 UTCUpdated Record last modified

hisiphp hisiphp DOWNGRADE

Affected: 1.0.8

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.8

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.8 (Debian / Ubuntu)

apt-cache madison hisiphp sudo apt install hisiphp=<VERSION_BEFORE_1.0.8> sudo apt-mark hold hisiphp

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

dnf --showduplicates list hisiphp sudo dnf downgrade hisiphp-<VERSION_BEFORE_1.0.8> sudo dnf versionlock add hisiphp

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-2018-17826?

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

Is CVE-2018-17826 being exploited?

CVE-2018-17826 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-2018-17826 affect?

CVE-2018-17826 affects hisiphp. Severity is high (CVSS 8.8). HisiPHP 1.0.8 allows CSRF via admin.php/admin/user/adduser.html to add an administrator account. The attacker can then use that account to execute arbitrary PHP code by leveraging app/common/model/AdminAnnex.php to add .php to the default l

How urgent is CVE-2018-17826?

Priority 46/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

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References

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