SB2026042797 - Reusing a Nonce, Key Pair in Encryption in Habitica
Published: April 27, 2026
Security Bulletin ID
SB2026042797
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Reusing a Nonce, Key Pair in Encryption (CVE-ID: N/A)
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to reusing a nonce in encryption in the encryption helper and group invitation handling logic when processing encrypted unsubscribe tokens and groupInvite parameters. A remote user can recover the keystream from a known-plaintext unsubscribe token and forge a crafted groupInvite ciphertext to disclose sensitive information.
User interaction is required because a new account must be registered with the crafted groupInvite parameter.
Remediation
Install update from vendor's website.