CVE-2025-59055: InstantCMS is a free and open source content management system

Q: How do I fix CVE-2025-59055?

instantcms: upgrade to newer than 2.17.3. Exact commands for each OS are on this page.

Q: Is CVE-2025-59055 being exploited?

CVE-2025-59055 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-59055 affect?

CVE-2025-59055 affects instantcms. Severity is medium (CVSS 4.7). InstantCMS is a free and open source content management system. A blind Server-Side Request Forgery (SSRF) vulnerability in InstantCMS up to and including 2.17.3 allows authenticated remote attackers to make nay HTTP/HTTPS request via the p

Q: How urgent is CVE-2025-59055?

Priority 31/100. Public exploit reference

Routine

MEDIUM 4.7UPGRADE

CVE-2025-59055 is a medium-severity flaw (CVSS 4.7) affecting instantcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

InstantCMS is a free and open source content management system. A blind Server-Side Request Forgery (SSRF) vulnerability in InstantCMS up to and including 2.17.3 allows authenticated remote attackers to make nay HTTP/HTTPS request via the package parameter. It is possible to make any HTTP/HTTPS request to any website in installer functionality. Due to such vulnerability it is possible to for example scan local network, call local services and its

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.7 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-918
Published	2025-09-11
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: instantcms

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

Am I affected?

Timeline

2025-09-11 19:15 UTCPublished CVE record published
2026-06-17 09:45 UTCUpdated Record last modified

instantcms instantcms UPGRADE

Affected: <= 2.17.3

Fixed in: newer than 2.17.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.17.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade instantcms

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade instantcms

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2025-59055?

instantcms: upgrade to newer than 2.17.3. Exact commands for each OS are on this page.

Is CVE-2025-59055 being exploited?

CVE-2025-59055 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-2025-59055 affect?

CVE-2025-59055 affects instantcms. Severity is medium (CVSS 4.7). InstantCMS is a free and open source content management system. A blind Server-Side Request Forgery (SSRF) vulnerability in InstantCMS up to and including 2.17.3 allows authenticated remote attackers to make nay HTTP/HTTPS request via the p

How urgent is CVE-2025-59055?

Priority 31/100. Public exploit reference

Related CVEs

CVE-2026-28281 HIGH 7.1 UPGRADE InstantCMS is a free and open source content management system
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CVE-2024-31212 MEDIUM 6.7 DOWNGRADE InstantCMS is a free and open source content management system
CVE-2013-10051 CRITICAL 9.8 UPGRADE A remote PHP code execution vulnerability exists in InstantCMS version 1.6 and earlier due to unsafe use of ev

References

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