How severe is CVE-2025-8447?

CVE-2025-8447 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2025-8447 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-8447?

CVE-2025-8447 affects Github Enterprise Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-8447?

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

Does CVE-2025-8447 have an EU (EUVD) identifier?

Yes. CVE-2025-8447 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25823.

When was CVE-2025-8447 published?

CVE-2025-8447 was published on 2025-08-26 and last updated on 2026-06-17.

CVE-2025-8447

CVE-2025-8447 is a low-severity vulnerability in Github Enterprise Server with a CVSS 3.x base score of 3.1. 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-639.

Key facts

Severity: Low (CVSS 3.x base score 3.1)
CVSS v4: 7.0
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-25823
Weakness: CWE-639
Affected product: Github Enterprise Server
Published: 2025-08-26
Last modified: 2026-06-17

Description

An improper access control vulnerability was identified in GitHub Enterprise Server that allowed users with access to any repository to retrieve limited code content from another repository by creating a diff between the repositories. To exploit this vulnerability, an attacker needed to know the name of a private repository along with its branches, tags, or commit SHAs that they could use to trigger compare/diff functionality and retrieve limited code without proper authorization. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.18, and was fixed in versions 3.14.17, 3.15.12, 3.16.8 and 3.17.5. This vulnerability was reported via the GitHub Bug Bounty program.

Frequently asked questions

What is CVE-2025-8447?: An improper access control vulnerability was identified in GitHub Enterprise Server that allowed users with access to any repository to retrieve limited code content from another repository by creating a diff between the repositories. To exploit this vulnerability, an attacker needed to know the name of a private repository along with its branches, tags, or commit SHAs that they could use to trigger compare/diff functionality and retrieve limited code without proper authorization. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.18, and was fixed in versions 3.14.17, 3.15.12, 3.16.8 and 3.17.5. This vulnerability was reported via the GitHub Bug Bounty program.
How severe is CVE-2025-8447?: CVE-2025-8447 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2025-8447 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-8447?: CVE-2025-8447 affects Github Enterprise Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-8447?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-8447 have an EU (EUVD) identifier?: Yes. CVE-2025-8447 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25823.
When was CVE-2025-8447 published?: CVE-2025-8447 was published on 2025-08-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*

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