CVE-2026-4799
CVE-2026-4799 is a medium-severity vulnerability in Search-guard Flx with a CVSS 3.x base score of 4.3. 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-601.
Key facts
- Severity: Medium (CVSS 3.x base score 4.3)
- EPSS exploit prediction: 0% (7th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-17474
- Weakness: CWE-601
- Affected product: Search-guard Flx
- Published:
- Last modified:
Description
In Search Guard FLX up to version 4.0.1, it is possible to use specially crafted requests to redirect the user to an untrusted URL.
Frequently asked questions
- What is CVE-2026-4799?
- In Search Guard FLX up to version 4.0.1, it is possible to use specially crafted requests to redirect the user to an untrusted URL.
- How severe is CVE-2026-4799?
- CVE-2026-4799 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.
- Is CVE-2026-4799 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-4799?
- CVE-2026-4799 affects Search-guard Flx. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-4799?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-4799 have an EU (EUVD) identifier?
- Yes. CVE-2026-4799 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17474.
- When was CVE-2026-4799 published?
- CVE-2026-4799 was published on 2026-03-31 and last updated on 2026-06-17.
References
- https://docs.search-guard.com/latest/changelog-searchguard-flx-4_1_0
- https://search-guard.com/cve-advisory/
Affected products (1)
- cpe:2.3:a:search-guard:flx:*:*:*:*:*:*:*:*
More vulnerabilities in Search-guard Flx
- CVE-2026-4818 — Medium (CVSS 6.8): In Search Guard FLX versions from 3.0.0 up to 4.0.1, there exists an issue which allows users without the necessary…
- CVE-2026-4819 — Medium (CVSS 4.9): In Search Guard FLX versions from 1.0.0 up to 4.0.1, the audit logging feature might log user credentials from users…
All CVEs affecting Search-guard Flx →
Other CWE-601 (Open Redirect) vulnerabilities
- CVE-2018-3774 — Critical (CVSS 10.0): Incorrect parsing in url-parse <1.4.3 returns wrong hostname which leads to multiple vulnerabilities such as SSRF, Open…
- CVE-2019-25282 — Critical (CVSS 9.8): V-SOL GPON/EPON OLT Platform v2.03 contains an open redirect vulnerability in the script that allows attackers to…
- CVE-2020-36912 — Critical (CVSS 9.8): Plexus anblick Digital Signage Management 3.1.13 contains an open redirect vulnerability in the 'PantallaLogin' script…
- CVE-2025-43526 — Critical (CVSS 9.8): This issue was addressed with improved URL validation. This issue is fixed in Safari 26.2, macOS Tahoe 26.2. On a Mac…
- CVE-2025-55031 — Critical (CVSS 9.8): Malicious pages could use Firefox for iOS to pass FIDO: links to the OS and trigger the hybrid passkey transport. An…
- CVE-2024-22891 — Critical (CVSS 9.8): Nteract v.0.28.0 was discovered to contain a remote code execution (RCE) vulnerability via the Markdown link.