How severe is CVE-2025-59827?

CVE-2025-59827 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-59827 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-59827?

CVE-2025-59827 affects Flagforge. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-59827?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-59827 have an EU (EUVD) identifier?

Yes. CVE-2025-59827 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-31051.

When was CVE-2025-59827 published?

CVE-2025-59827 was published on 2025-09-24 and last updated on 2026-06-17.

CVE-2025-59827

CVE-2025-59827 is a critical-severity vulnerability in Flagforge with a CVSS 3.x base score of 9.8. 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-862.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-31051
Weakness: CWE-862
Affected product: Flagforge
Published: 2025-09-24
Last modified: 2026-06-17

Description

Flag Forge is a Capture The Flag (CTF) platform. In version 2.1.0, the /api/admin/assign-badge endpoint lacks proper access control, allowing any authenticated user to assign high-privilege badges (e.g., Staff) to themselves. This could lead to privilege escalation and impersonation of administrative roles. This issue has been patched in version 2.2.0.

Frequently asked questions

What is CVE-2025-59827?: Flag Forge is a Capture The Flag (CTF) platform. In version 2.1.0, the /api/admin/assign-badge endpoint lacks proper access control, allowing any authenticated user to assign high-privilege badges (e.g., Staff) to themselves. This could lead to privilege escalation and impersonation of administrative roles. This issue has been patched in version 2.2.0.
How severe is CVE-2025-59827?: CVE-2025-59827 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-59827 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-59827?: CVE-2025-59827 affects Flagforge. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-59827?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-59827 have an EU (EUVD) identifier?: Yes. CVE-2025-59827 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-31051.
When was CVE-2025-59827 published?: CVE-2025-59827 was published on 2025-09-24 and last updated on 2026-06-17.

References

https://github.com/FlagForgeCTF/flagForge/security/advisories/GHSA-7944-xvv7-cv79

Affected products (1)

cpe:2.3:a:flagforge:flagforge:2.1.0:*:*:*:*:*:*:*

More vulnerabilities in Flagforge

CVE-2025-59841 — Critical (CVSS 9.8): Flag Forge is a Capture The Flag (CTF) platform. In versions from 2.2.0 to before 2.3.1, the FlagForge web application…
CVE-2025-61777 — Critical (CVSS 9.4): Flag Forge is a Capture The Flag (CTF) platform. Starting in version 2.0.0 and prior to version 2.3.2, the…
CVE-2025-59932 — High (CVSS 8.6): Flag Forge is a Capture The Flag (CTF) platform. From versions 2.0.0 to before 2.3.1, the /api/resources endpoint…
CVE-2025-59826 — High (CVSS 7.6): Flag Forge is a Capture The Flag (CTF) platform. In version 2.1.0, non-admin users can create arbitrary challenges,…
CVE-2026-21868 — High (CVSS 7.5): Flag Forge is a Capture The Flag (CTF) platform. Versions 2.3.2 and below have a Regular Expression Denial of Service…
CVE-2025-59833 — High (CVSS 7.5): Flag Forge is a Capture The Flag (CTF) platform. In versions from 2.1.0 to before 2.3.0, the API endpoint GET…

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