How severe is CVE-2025-59833?

CVE-2025-59833 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-59833 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-59833?

CVE-2025-59833 affects Flagforge. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-59833?

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

Does CVE-2025-59833 have an EU (EUVD) identifier?

Yes. CVE-2025-59833 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-31050.

When was CVE-2025-59833 published?

CVE-2025-59833 was published on 2025-09-24 and last updated on 2026-06-17.

CVE-2025-59833

CVE-2025-59833 is a high-severity vulnerability in Flagforge with a CVSS 3.x base score of 7.5. 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-200.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-31050
Weakness: CWE-200
Affected product: Flagforge
Published: 2025-09-24
Last modified: 2026-06-17

Description

Flag Forge is a Capture The Flag (CTF) platform. In versions from 2.1.0 to before 2.3.0, the API endpoint GET /api/problems/:id returns challenge hints in plaintext within the question object, regardless of whether the user has unlocked them via point deduction. Users can view all hints for free, undermining the business logic of the platform and reducing the integrity of the challenge system. This issue has been patched in version 2.3.0.

Frequently asked questions

What is CVE-2025-59833?: Flag Forge is a Capture The Flag (CTF) platform. In versions from 2.1.0 to before 2.3.0, the API endpoint GET /api/problems/:id returns challenge hints in plaintext within the question object, regardless of whether the user has unlocked them via point deduction. Users can view all hints for free, undermining the business logic of the platform and reducing the integrity of the challenge system. This issue has been patched in version 2.3.0.
How severe is CVE-2025-59833?: CVE-2025-59833 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-59833 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-59833?: CVE-2025-59833 affects Flagforge. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-59833?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-59833 have an EU (EUVD) identifier?: Yes. CVE-2025-59833 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-31050.
When was CVE-2025-59833 published?: CVE-2025-59833 was published on 2025-09-24 and last updated on 2026-06-17.

References

https://github.com/FlagForgeCTF/flagForge/security/advisories/GHSA-hm85-2j65-j8j2

Affected products (1)

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

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-2025-59827 — Critical (CVSS 9.8): Flag Forge is a Capture The Flag (CTF) platform. In version 2.1.0, the /api/admin/assign-badge endpoint lacks proper…
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