Username enumeration via password-reset timing discrepancy
Published Apr 2, 2026 · Updated Apr 2, 2026
Timing-based user enumeration in osTicket 1.18.2 and earlier allows remote attackers to identify valid usernames through password resets. The /pwreset.php sendmail path performs SMTP delivery for an existing username but immediately rejects an unknown one, exposing account validity through response latency. The unauthenticated attack requires SMTP to be configured and discloses usernames only; it does not directly expose credentials.
Summary
What happened
Timing-based user enumeration in osTicket 1.18.2 and earlier allows remote attackers to identify valid usernames through password resets. The /pwreset.php sendmail path performs SMTP delivery for an existing username but immediately rejects an unknown one, exposing account validity through response latency. The unauthenticated attack requires SMTP to be configured and discloses usernames only; it does not directly expose credentials.
The record
- CVE
- CVE-2026-26895
- Published
- Apr 2, 2026
- Updated
- Apr 2, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 2, 2026CVE publishedPublication date reported by the CVE source.
- Apr 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
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Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
- CSA Cyber password-reset timing proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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