CVE-2017-17561: SeaCMS 6.56 allows remote authenticated administrators to execute arbitrary PHP code via a crafted token field

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HIGH 7.2DOWNGRADE

CVE-2017-17561 is a high-severity flaw (CVSS 7.2) affecting seacms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SeaCMS 6.56 allows remote authenticated administrators to execute arbitrary PHP code via a crafted token field to admin/admin_ping.php, which interacts with data/admin/ping.php.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Published	2017-12-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: seacms project

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

Am I affected?

Timeline

2017-12-12 18:29 UTCPublished CVE record published
2026-06-17 01:11 UTCUpdated Record last modified

seacms project seacms DOWNGRADE

Affected: 6.56

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.56

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 6.56 (Debian / Ubuntu)

apt-cache madison seacms sudo apt install seacms=<VERSION_BEFORE_6.56> sudo apt-mark hold seacms

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

dnf --showduplicates list seacms sudo dnf downgrade seacms-<VERSION_BEFORE_6.56> sudo dnf versionlock add seacms

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-2017-17561?

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

Is CVE-2017-17561 being exploited?

CVE-2017-17561 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-2017-17561 affect?

CVE-2017-17561 affects seacms. Severity is high (CVSS 7.2). SeaCMS 6.56 allows remote authenticated administrators to execute arbitrary PHP code via a crafted token field to admin/admin_ping.php, which interacts with data/admin/ping.php.

How urgent is CVE-2017-17561?

Priority 48/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2025-15003 MEDIUM 4.7 UPGRADE A vulnerability was found in SeaCMS up to 13.3
CVE-2025-10662 MEDIUM 4.7 UPGRADE A vulnerability has been found in SeaCMS up to 13.3
CVE-2025-11071 MEDIUM 4.7 DOWNGRADE A security vulnerability has been detected in SeaCMS 13.3.20250820
CVE-2023-50470 MEDIUM 5.4 DOWNGRADE A cross-site scripting (XSS) vulnerability in the component admin_ Video.php of SeaCMS v12.8 allows attackers
CVE-2023-46987 HIGH 8.8 DOWNGRADE SeaCMS v12.9 was discovered to contain a remote code execution (RCE) vulnerability via the component /augap/ad

References

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