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openssl_encrypt EUVDEUVD-2026-67047

| CVE-2026-81691 HIGH
Cleartext Transmission of Sensitive Information (CWE-319)
2026-08-27 VulnCheck GHSA-cw5r-mrc2-mrh5
Information Disclosure Openssl Encrypt
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.9 MEDIUM

AC:H reflects the required network-path positioning for interception; C:H for complete credential exposure; I:N and A:N as no write or availability impact applies.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Aug 27, 2026 - 18:02 EUVD
Analysis Generated
Aug 27, 2026 - 17:40 vuln.today
CVE Published
Aug 27, 2026 - 14:50 cve.org
HIGH 8.7

DescriptionCVE.org

openssl_encrypt versions before 1.4.9 fail to validate server URLs in login and register_with_email functions, accepting unencrypted http:// URLs and unconfigured hosts. Attackers on the network path can intercept cleartext credentials including client_id, passwords, and JWTs to achieve full keyserver account takeover.

AnalysisAI

Cleartext credential interception in jahlives/openssl_encrypt before 1.4.9 exposes client_id values, passwords, and JWTs to network-path attackers through the login and register_with_email functions. The library accepts unencrypted http:// URLs and unconfigured host values without validation, transmitting authentication material in cleartext to keyservers and enabling full keyserver account takeover. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Gain network path position (MitM)
Delivery
Trigger HTTP keyserver request via login or register_with_email
Exploit
Passively capture cleartext HTTP traffic
Execution
Extract client_id, password, and JWT tokens
Persist
Authenticate to keyserver as victim
Impact
Achieve full keyserver account takeover
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Vulnerability AssessmentAI

Exploitation Exploitation requires the attacker to hold a network-path position between the vulnerable application and its keyserver - achievable via ARP spoofing on a shared LAN segment, a rogue Wi-Fi access point, a compromised network device, or ISP-level traffic interception. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.7 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H) accurately reflects theoretical severity: no privileges or user interaction are required, and credential exposure is complete. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has gained a network-path position between the application server and its keyserver - for example via ARP poisoning on a shared LAN or by operating a rogue access point - passively captures HTTP traffic. When any user triggers the login or register_with_email function, their client_id, password, and JWT are transmitted as cleartext HTTP, readable with standard capture tools such as tcpdump or Wireshark. …
Remediation Upgrade to openssl_encrypt version 1.4.9 or later, which introduces server URL validation enforcing HTTPS-only keyserver communication in the affected functions. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all applications and services using jahlives/openssl_encrypt to establish exposure scope and identify critical systems. …

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EUVD-2026-67047 vulnerability details – vuln.today
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