Server URL Validation Flaw in openssl_encrypt Affects Security of Applications
CVE-2026-81691

8.7HIGH

Key Information:

Vendor

Jahlives

Status
OpenSSL Encrypt
Vendor
CVE Published:
27 August 2026

What is CVE-2026-81691?

The openssl_encrypt library prior to version 1.4.9 contains a flaw where it fails to properly validate server URLs in its login and register_with_email functions. This oversight allows for the inclusion of unencrypted http:// URLs and unconfigured hosts, potentially exposing sensitive user credentials such as client IDs, passwords, and JSON Web Tokens (JWTs) to attackers on the network. Consequently, this can lead to unauthorized account access and compromise the security integrity of the affected applications.

Affected Version(s)

openssl_encrypt 0 < 1.4.9

openssl_encrypt 1.4.9

References

https://github.com/jahlives/openssl_encrypt/security/advi...
vendor-advisory
https://www.vulncheck.com/advisories/openssl-encrypt-befo...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.