A GitHub Gist posted by a teenage bug hunter says a single Zendesk flaw could be used to read private support ticket histories at a wide range of companies. The author, Daniel, describes the issue as a simple email spoofing weakness in Zendesk's support workflow, and says he found it while looking for ordinary security bugs.
At the center of the write-up is the way Zendesk handles inbound support mail. According to Daniel, the system creates tickets from messages sent to a support address and uses a reply-to format tied to the ticket ID. He says that if an attacker knows the support address and can guess a ticket number, they can spoof the original sender and use Zendesk's collaboration feature to add themselves to the thread. Once that happens, he says, the attacker can view the full ticket history.
The write-up presents the flaw as a broad exposure rather than a narrow edge case. Daniel says support conversations often contain sensitive account details, internal notes and personal information, which is why a weakness in a ticketing platform can have outsized consequences. He says the problem was not some exotic browser exploit or server compromise, but a mundane failure to properly defend against spoofed mail.
The author also says the bug bounty process did not go smoothly. His report, he writes, was first rejected by the triage process as out of scope because it relied on email spoofing. He says he then asked for the report to be escalated to Zendesk staff, only to be turned away again. The point of the story, in his telling, is not just that the bug existed, but that the response showed how security programs can misclassify real risk when a weakness sits between products and policy.
Daniel then connects the Zendesk issue to a broader attack chain involving support workflows and login verification. He references a prior write-up about ticket-based abuse and says that email verification flows from major providers can interact badly with support systems if the provider and ticketing platform do not agree on what counts as a trusted message. The examples he uses are presented as part of his own research narrative, not as independent vendor statements.
The useful takeaway is not the mechanics of exploitation, which are already public in his post, but the structural lesson. Support platforms are now deeply tied to identity systems, and a flaw in email handling can ripple into account access, ticket privacy and internal operations. In the author's account, that is exactly what happened here.
