Files
vikunja/pkg/models
kolaenteandkolaente 2025d8c4f8 fix(api tokens): guard GetTokenFromTokenString against short token strings
GetTokenFromTokenString sliced token[len(token)-8:] without checking the
length, so any string with the "tk_" prefix but shorter than 8 characters
panicked with "slice bounds out of range".

The helper is reachable with attacker-controlled input from three
unauthenticated call sites: the main API bearer-token middleware
(/api/v1 and /api/v2) and CalDAV basic auth on /dav/ and
/.well-known/caldav. Each request was turned into a 500 by the global
panic recovery, at the cost of a full stack unwind, an error-level log
line and a Sentry event. On the main API the token middleware also runs
before the rate limiter, and the CalDAV routes are not rate limited at
all.

The same guard already existed in the feeds auth path; fixing it at the
shared choke point closes all sites at once. Real tokens are the prefix
plus 40 hex characters, so no legitimate token is affected — a too-short
token now gets the same rejection as any other invalid one.
2026-07-28 06:59:04 +00:00
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