Description
WebCalendar 1.0.1 to 1.0.3 generates different error messages depending on whether or not a username is valid, which allows remote attackers to enumerate valid usernames.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 3.1 | webcalendar | 0.9.45-4sarge4 | DSA-1056-1 |
Advisories 1
- DSA-1056-1 webcalendar - verbose error message Debian Security (DSA / DLA) · Mar 9, 2026
References
- 17853 vdb-entry
- 25280 vdb-entry
- DSA-1056 vendor-advisory
- webcalendar-user-information-disclosure(26262) vdb-entry
- 20108 third-party-advisory
- 20060505 Re: WebCalendar User Account Enumeration Weakness mailing-list
- 19974 third-party-advisory
- 20060504 WebCalendar User Account Enumeration Weakness mailing-list