How severe is CVE-2018-5403?

CVE-2018-5403 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-5403 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-5403?

CVE-2018-5403 primarily affects Imperva Securesphere. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-5403?

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.

When was CVE-2018-5403 published?

CVE-2018-5403 was published on 2019-01-10 and last updated on 2026-06-17.

CVE-2018-5403

CVE-2018-5403 is a high-severity vulnerability in Imperva Securesphere with a CVSS 3.x base score of 8.1. 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-287.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Imperva Securesphere
Published: 2019-01-10
Last modified: 2026-06-17

Description

Imperva SecureSphere gateway (GW) running v13, for both pre-First Time Login or post-First Time Login (FTL), if the attacker knows the basic authentication passwords, the GW may be vulnerable to RCE through specially crafted requests, from the web access management interface.

Frequently asked questions

What is CVE-2018-5403?: Imperva SecureSphere gateway (GW) running v13, for both pre-First Time Login or post-First Time Login (FTL), if the attacker knows the basic authentication passwords, the GW may be vulnerable to RCE through specially crafted requests, from the web access management interface.
How severe is CVE-2018-5403?: CVE-2018-5403 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-5403 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-5403?: CVE-2018-5403 primarily affects Imperva Securesphere. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-5403?: 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.
When was CVE-2018-5403 published?: CVE-2018-5403 was published on 2019-01-10 and last updated on 2026-06-17.

References

https://www.exploit-db.com/exploits/45542

Affected products (3)

cpe:2.3:a:imperva:securesphere:13.0.10:*:*:*:*:*:*:*
cpe:2.3:a:imperva:securesphere:13.1.10:*:*:*:*:*:*:*
cpe:2.3:a:imperva:securesphere:13.2.10:*:*:*:*:*:*:*

More vulnerabilities in Imperva Securesphere

CVE-2018-19646 — Critical (CVSS 9.8): The Python CGI scripts in PWS in Imperva SecureSphere 13.0.10, 13.1.10, and 13.2.10 allow remote attackers to execute…
CVE-2018-16660 — High (CVSS 8.8): A command injection vulnerability in PWS in Imperva SecureSphere 13.0.0.10 and 13.1.0.10 Gateway allows an attacker…
CVE-2018-5413 — High (CVSS 8.8): Imperva SecureSphere running v13.0, v12.0, or v11.5 allows low privileged users to add SSH login keys to the admin…
CVE-2018-5412 — High (CVSS 7.8): Imperva SecureSphere running v12.0.0.50 is vulnerable to local arbitrary code execution, escaping sealed-mode.
CVE-2013-4091 — High (CVSS 7.5): The SecureSphere Operations Manager (SOM) Management Server in Imperva SecureSphere 9.0.0.5 does not have an off…
CVE-2013-4095 — Medium (CVSS 6.5): plain/actionsets.html in the SecureSphere Operations Manager (SOM) Management Server in Imperva SecureSphere 9.0.0.5…

All CVEs affecting Imperva Securesphere →

Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-45480 — Critical (CVSS 10.0): Improper authentication in Azure Active Directory allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →