{"items":[{"id":"NVI-00011935","kind":"vulnerability","title":"Vikunja: CalDAV and feeds BasicAuth endpoints have no rate limit, bypassing the anti-brute-force floor on account passwords","revision":4,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-m469-88xx-8rx2","CVE-2026-91973"],"plain_summary":"GitHub lists this reviewed advisory for code.vikunja.io/api. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-007e288703dac58cddeaa8c7fd01d21d"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-09-16T20:16:09.343Z","value":"7.5 HIGH (3.1)","meaning":"disclosure@vulncheck.com severity; no combined Null risk score.","source_id":"sr-481188821bea0555027b480013621048"},{"kind":"CVSS","as_of":"2026-09-16T20:16:09.343Z","value":"8.7 HIGH (4.0)","meaning":"disclosure@vulncheck.com severity; no combined Null risk score.","source_id":"sr-481188821bea0555027b480013621048"},{"kind":"EPSS","as_of":"2026-11-03T12:00:27.000Z","value":"0.672%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.52126. Missing scores are unknown.","source_id":"sr-007e288703dac58cddeaa8c7fd01d21d"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-65b543dbd69a7d3ab5b8f14378205db4","url":"https://github.com/advisories/GHSA-m469-88xx-8rx2","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-m469-88xx-8rx2","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T23:14:22.124Z"},{"id":"sr-481188821bea0555027b480013621048","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91973","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-91973","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-04T09:59:38.530Z"},{"id":"sr-007e288703dac58cddeaa8c7fd01d21d","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-91973","publisher":"FIRST EPSS","observed_at":"2026-11-03T17:45:16.087Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-65b543dbd69a7d3ab5b8f14378205db4"],"technology":"code.vikunja.io/api","known_exclusions":[],"conditions_summary":"### Summary\nThe `/dav`, `/.well-known`, and `/feeds` groups are registered on the root Echo instance with only BasicAuth and no rate limiter. CalDAV BasicAuth accepts the plain account password, so password guessing over `/dav` is unbounded and never returns 429, while `/api/v1/login` is throttled from the tenth attempt. The only anti-brute-force control on the instance is therefore bypassable.\n\n### Details\n`pkg/routes/routes.go` (~lines 238-249) registers `/.well-known`, `/dav`, and `/feeds` with `middleware.BasicAuth(...)` and nothing else; `registerCalDavRoutes` adds no limiter. `pkg/routes/caldav/auth.go` (~lines 88-93) falls through to `user.CheckUserCredentials` with the plain account password when no CalDAV token matches. In contrast, `/register`, `/login`, etc. are wrapped by `unauthRateLimit()` — an unconditional 10/min/IP pre-auth floor that ignores `ratelimit.enabled` (default false).\n\nTOTP-enabled accounts and bot users are correctly refused, so this targets password-only accounts.\n\n### PoC (verified at runtime against v2.5.0)\n```\nPOST /api/v1/login  x25 wrong passwords  -> 429 from attempt 2 (throttled)\nPROPFIND /dav/principals/{user}/  x60 wrong passwords  -> 401 x60,","public_affected_ranges":["<= 2.5.0"]}],"null_published_at":"2026-11-05T19:10:23.238Z","source_updated_at":"2026-10-09T20:52:06.000Z","source_disclosed_at":"2026-10-09T20:52:04.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T23:14:22.124Z"},{"id":"NVI-00011935","kind":"vulnerability","title":"Vikunja: CalDAV and feeds BasicAuth endpoints have no rate limit, bypassing the anti-brute-force floor on account passwords","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-m469-88xx-8rx2","CVE-2026-91973"],"plain_summary":"GitHub lists this reviewed advisory for code.vikunja.io/api. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-007e288703dac58cddeaa8c7fd01d21d"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"EPSS","as_of":"2026-11-03T12:00:27.000Z","value":"0.672%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.52126. Missing scores are unknown.","source_id":"sr-007e288703dac58cddeaa8c7fd01d21d"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-65b543dbd69a7d3ab5b8f14378205db4","url":"https://github.com/advisories/GHSA-m469-88xx-8rx2","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-m469-88xx-8rx2","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T23:14:22.124Z"},{"id":"sr-007e288703dac58cddeaa8c7fd01d21d","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-91973","publisher":"FIRST EPSS","observed_at":"2026-11-03T17:45:16.087Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-65b543dbd69a7d3ab5b8f14378205db4"],"technology":"code.vikunja.io/api","known_exclusions":[],"conditions_summary":"### Summary\nThe `/dav`, `/.well-known`, and `/feeds` groups are registered on the root Echo instance with only BasicAuth and no rate limiter. CalDAV BasicAuth accepts the plain account password, so password guessing over `/dav` is unbounded and never returns 429, while `/api/v1/login` is throttled from the tenth attempt. The only anti-brute-force control on the instance is therefore bypassable.\n\n### Details\n`pkg/routes/routes.go` (~lines 238-249) registers `/.well-known`, `/dav`, and `/feeds` with `middleware.BasicAuth(...)` and nothing else; `registerCalDavRoutes` adds no limiter. `pkg/routes/caldav/auth.go` (~lines 88-93) falls through to `user.CheckUserCredentials` with the plain account password when no CalDAV token matches. In contrast, `/register`, `/login`, etc. are wrapped by `unauthRateLimit()` — an unconditional 10/min/IP pre-auth floor that ignores `ratelimit.enabled` (default false).\n\nTOTP-enabled accounts and bot users are correctly refused, so this targets password-only accounts.\n\n### PoC (verified at runtime against v2.5.0)\n```\nPOST /api/v1/login  x25 wrong passwords  -> 429 from attempt 2 (throttled)\nPROPFIND /dav/principals/{user}/  x60 wrong passwords  -> 401 x60,","public_affected_ranges":["<= 2.5.0"]}],"null_published_at":"2026-11-04T10:04:35.954Z","source_updated_at":"2026-10-09T20:52:06.000Z","source_disclosed_at":"2026-10-09T20:52:04.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T23:14:22.124Z"},{"id":"NVI-00011935","kind":"vulnerability","title":"Vikunja: CalDAV and feeds BasicAuth endpoints have no rate limit, bypassing the anti-brute-force floor on account passwords","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-m469-88xx-8rx2","CVE-2026-91973"],"plain_summary":"GitHub lists this reviewed advisory for code.vikunja.io/api. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-1318b54d3f34c3cb3499c57e77d7aacc"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"EPSS","as_of":"2026-11-01T12:00:16.000Z","value":"0.672%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.52089. Missing scores are unknown.","source_id":"sr-1318b54d3f34c3cb3499c57e77d7aacc"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-65b543dbd69a7d3ab5b8f14378205db4","url":"https://github.com/advisories/GHSA-m469-88xx-8rx2","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-m469-88xx-8rx2","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T23:14:22.124Z"},{"id":"sr-1318b54d3f34c3cb3499c57e77d7aacc","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-91973","publisher":"FIRST EPSS","observed_at":"2026-11-01T14:28:32.289Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-65b543dbd69a7d3ab5b8f14378205db4"],"technology":"code.vikunja.io/api","known_exclusions":[],"conditions_summary":"### Summary\nThe `/dav`, `/.well-known`, and `/feeds` groups are registered on the root Echo instance with only BasicAuth and no rate limiter. CalDAV BasicAuth accepts the plain account password, so password guessing over `/dav` is unbounded and never returns 429, while `/api/v1/login` is throttled from the tenth attempt. The only anti-brute-force control on the instance is therefore bypassable.\n\n### Details\n`pkg/routes/routes.go` (~lines 238-249) registers `/.well-known`, `/dav`, and `/feeds` with `middleware.BasicAuth(...)` and nothing else; `registerCalDavRoutes` adds no limiter. `pkg/routes/caldav/auth.go` (~lines 88-93) falls through to `user.CheckUserCredentials` with the plain account password when no CalDAV token matches. In contrast, `/register`, `/login`, etc. are wrapped by `unauthRateLimit()` — an unconditional 10/min/IP pre-auth floor that ignores `ratelimit.enabled` (default false).\n\nTOTP-enabled accounts and bot users are correctly refused, so this targets password-only accounts.\n\n### PoC (verified at runtime against v2.5.0)\n```\nPOST /api/v1/login  x25 wrong passwords  -> 429 from attempt 2 (throttled)\nPROPFIND /dav/principals/{user}/  x60 wrong passwords  -> 401 x60,","public_affected_ranges":["<= 2.5.0"]}],"null_published_at":"2026-11-03T17:49:18.477Z","source_updated_at":"2026-10-09T20:52:06.000Z","source_disclosed_at":"2026-10-09T20:52:04.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T23:14:22.124Z"},{"id":"NVI-00011935","kind":"vulnerability","title":"Vikunja: CalDAV and feeds BasicAuth endpoints have no rate limit, bypassing the anti-brute-force floor on account passwords","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-m469-88xx-8rx2","CVE-2026-91973"],"plain_summary":"GitHub lists this reviewed advisory for code.vikunja.io/api. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-65b543dbd69a7d3ab5b8f14378205db4"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-65b543dbd69a7d3ab5b8f14378205db4","url":"https://github.com/advisories/GHSA-m469-88xx-8rx2","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-m469-88xx-8rx2","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T23:14:22.124Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-65b543dbd69a7d3ab5b8f14378205db4"],"technology":"code.vikunja.io/api","known_exclusions":[],"conditions_summary":"### Summary\nThe `/dav`, `/.well-known`, and `/feeds` groups are registered on the root Echo instance with only BasicAuth and no rate limiter. CalDAV BasicAuth accepts the plain account password, so password guessing over `/dav` is unbounded and never returns 429, while `/api/v1/login` is throttled from the tenth attempt. The only anti-brute-force control on the instance is therefore bypassable.\n\n### Details\n`pkg/routes/routes.go` (~lines 238-249) registers `/.well-known`, `/dav`, and `/feeds` with `middleware.BasicAuth(...)` and nothing else; `registerCalDavRoutes` adds no limiter. `pkg/routes/caldav/auth.go` (~lines 88-93) falls through to `user.CheckUserCredentials` with the plain account password when no CalDAV token matches. In contrast, `/register`, `/login`, etc. are wrapped by `unauthRateLimit()` — an unconditional 10/min/IP pre-auth floor that ignores `ratelimit.enabled` (default false).\n\nTOTP-enabled accounts and bot users are correctly refused, so this targets password-only accounts.\n\n### PoC (verified at runtime against v2.5.0)\n```\nPOST /api/v1/login  x25 wrong passwords  -> 429 from attempt 2 (throttled)\nPROPFIND /dav/principals/{user}/  x60 wrong passwords  -> 401 x60,","public_affected_ranges":["<= 2.5.0"]}],"null_published_at":"2026-11-01T01:03:56.616Z","source_updated_at":"2026-10-09T20:52:06.000Z","source_disclosed_at":"2026-10-09T20:52:04.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T23:14:22.124Z"}],"next_cursor":null,"snapshot_revision":"42594"}