How severe is CVE-2025-59055?

CVE-2025-59055 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2025-59055 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-59055?

CVE-2025-59055 affects Instantcms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-59055?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-59055 have an EU (EUVD) identifier?

Yes. CVE-2025-59055 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-28984.

When was CVE-2025-59055 published?

CVE-2025-59055 was published on 2025-09-11 and last updated on 2026-06-17.

CVE-2025-59055

CVE-2025-59055 is a medium-severity vulnerability in Instantcms with a CVSS 3.x base score of 4.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: Medium (CVSS 3.x base score 4.7)
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-28984
Weakness: CWE-918
Affected product: Instantcms
Published: 2025-09-11
Last modified: 2026-06-17

Description

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 functions, conduct a DoS attack, and/or disclose a server's real IP if it's behind a reverse proxy. It is also possible to exhaust server resources by sending plethora of such requests. As of time of publication, no patched releases are available.

Frequently asked questions

What is CVE-2025-59055?: 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 functions, conduct a DoS attack, and/or disclose a server's real IP if it's behind a reverse proxy. It is also possible to exhaust server resources by sending plethora of such requests. As of time of publication, no patched releases are available.
How severe is CVE-2025-59055?: CVE-2025-59055 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2025-59055 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-59055?: CVE-2025-59055 affects Instantcms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-59055?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-59055 have an EU (EUVD) identifier?: Yes. CVE-2025-59055 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-28984.
When was CVE-2025-59055 published?: CVE-2025-59055 was published on 2025-09-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:instantcms:instantcms:*:*:*:*:*:*:*:*

More vulnerabilities in Instantcms

CVE-2013-10051 — Critical (CVSS 9.8): A remote PHP code execution vulnerability exists in InstantCMS version 1.6 and earlier due to unsafe use of eval()…
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CVE-2024-31212 — Medium (CVSS 6.7): InstantCMS is a free and open source content management system. A SQL injection vulnerability affects instantcms…
CVE-2023-4655 — Medium (CVSS 6.1): Cross-site Scripting (XSS) - Reflected in GitHub repository instantsoft/icms2 prior to 2.16.1.
CVE-2018-14382 — Medium (CVSS 6.1): InstantCMS 2.10.1 has /redirect?url= XSS.

All CVEs affecting Instantcms →

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