CVE-2026-27884
CVE-2026-27884 is a medium-severity vulnerability with a CVSS 3.x base score of 5.3. 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-22.
Key facts
- Severity: Medium (CVSS 3.x base score 5.3)
- EPSS exploit prediction: 0% (25th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-8790
- Weakness: CWE-22
- Published:
- Last modified:
Description
NetExec is a network execution tool. Prior to version 1.5.1, the module spider_plus improperly creates the output file and folder path when saving files from SMB shares. It does not take into account that it is possible for Linux SMB shares to have path traversal characters such as `../` in them. An attacker can craft a filename in an SMB share that includes these characters, which when spider_plus crawls and downloads, can write or overwrite arbitrary files. The issue is patched in v1.5.1. As a workaround, do not run spider_plus with DOWNLOAD=true against targets.
Frequently asked questions
- What is CVE-2026-27884?
- NetExec is a network execution tool. Prior to version 1.5.1, the module spider_plus improperly creates the output file and folder path when saving files from SMB shares. It does not take into account that it is possible for Linux SMB shares to have path traversal characters such as `../` in them. An attacker can craft a filename in an SMB share that includes these characters, which when spider_plus crawls and downloads, can write or overwrite arbitrary files. The issue is patched in v1.5.1. As a workaround, do not run spider_plus with DOWNLOAD=true against targets.
- How severe is CVE-2026-27884?
- CVE-2026-27884 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
- Is CVE-2026-27884 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-27884?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-27884 have an EU (EUVD) identifier?
- Yes. CVE-2026-27884 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8790.
- When was CVE-2026-27884 published?
- CVE-2026-27884 was published on 2026-02-26 and last updated on 2026-06-17.
References
- https://github.com/Pennyw0rth/NetExec/commit/7d027f2774d0520b322d60f9c99b9ab3edb4035e
- https://github.com/Pennyw0rth/NetExec/issues/1120
- https://github.com/Pennyw0rth/NetExec/pull/1121
- https://github.com/Pennyw0rth/NetExec/security/advisories/GHSA-fccr-6qm2-7h27
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