CVE-2026-59563

Zscaler MCP Server versions 0.7.0 and 0.7.1 has an issue where HMAC confirmation tokens were not bound to the target resource identifier, allowing an MCP client or agent to replay a token generated for one resource to affect another resource of the same type. This issue is fixed in version 0.7.2...

EUVD-2026-88244

Zscaler MCP Server versions 0.7.0 and 0.7.1 has an issue where HMAC confirmation tokens were not bound to the target resource identifier, allowing an MCP client or agent to replay a token generated for one resource to affect another resource of the same type. This issue is fixed in version 0.7.2...

CVE-2026-59563: Authentication Bypass by Primary Weakness

Zscaler MCP Server versions 0.7.0 and 0.7.1 has an issue where HMAC confirmation tokens were not bound to the target resource identifier, allowing an MCP client or agent to replay a token generated for one resource to affect another resource of the same type. This issue is fixed in version 0.7.2...

PT-2026-99880

Name of the Vulnerable Software and Affected Versions Zscaler MCP Server versions 0.7.0 through 0.7.1 Description HMAC confirmation tokens are not bound to the target resource identifier. This allows an MCP client or agent to replay a token generated for one resource to affect another resource of...

GHSA-QRM9-F75W-HG4C Ash Authentication has flawed token revocation checking logic in actions generated by `mix ash_authentication.install`

Impact Applications which have been bootstrapped by the new igniter installer since AshAuthentication v4.1.0 and who have used the magic link strategy, password resets, confirmation, or are manually revoking tokens are affected by revoked tokens being allowed to verify as valid. If you did not us...

PT-2025-6376

Name of the Vulnerable Software and Affected Versions AshAuthentication versions 4.1.0 through 4.4.8 Description The issue affects applications that have been bootstrapped by the new igniter installer since AshAuthentication v4.1.0 and have used the magic link strategy or are manually revoking...

GSA Bounty: 2FA bypass - confirmation tokens don't expire

Hi there, Because of the limitation of the site, accounts may be locked down for 10 minutes. I found 2 ways to bypass this lock period. First one with the confirmation mail that we get when we sign on. If we get the token this way below, we can change account password and bypass the lock period a...