{"id":"GHSA-m547-hp4w-j6jx","revision":null,"records":[{"revision":"6395d1ddc5f443f69e1f49378beb5626","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-29794","aliases":[],"title":"Vikunja has Rate-Limit Bypass for Unauthenticated Users via Spoofed Headers","description":"Vikunja is an open-source self-hosted task management platform. Starting in version 0.8 and prior to version 2.2.0, unauthenticated users are able to bypass the application's built-in rate-limits by spoofing the `X-Forwarded-For` or `X-Real-IP` headers due to the rate-limit relying on the value of `(echo.Context).RealIP`. Unauthenticated users can abuse endpoints available to them for different potential impacts. The immediate concern would be brute-forcing usernames or specific accounts' passwords. This bypass allows unlimited requests against unauthenticated endpoints. Version 2.2.0 patches the issue.","state":0,"publishedAt":"2026-03-20T14:39:59.035+00:00","modifiedAt":"2026-03-20T17:15:23.14+00:00","affected":[{"ecosystem":"Vendor product","name":"vikunja","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"go-vikunja\",\n                    \"product\": \"vikunja\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 0.8, < 2.2.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-m547-hp4w-j6jx","https://vikunja.io/changelog/vikunja-v2.2.0-was-released"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-29794","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-29794","identifiers":["CVE-2026-29794"]},"retained":false,"historicalAffected":[]},{"revision":"5687387fa15b44d6af3f326cfc7299e1","observedAt":"2026-11-15T09:29:47.814+00:00","statement":{"source":"euvd","id":"EUVD-2026-13706","aliases":["CVE-2026-29794","GHSA-m547-hp4w-j6jx"],"title":"Vikunja is an open-source self-hosted task management platform. Starting in version 0.8 and prior to version 2.2.0, unauthenticated users are able to bypass the application's built-in rate-limits by spoofing the `X-Forwarded-For` or `X-Real…","description":"Vikunja is an open-source self-hosted task management platform. Starting in version 0.8 and prior to version 2.2.0, unauthenticated users are able to bypass the application's built-in rate-limits by spoofing the `X-Forwarded-For` or `X-Real-IP` headers due to the rate-limit relying on the value of `(echo.Context).RealIP`. Unauthenticated users can abuse endpoints available to them for different potential impacts. The immediate concern would be brute-forcing usernames or specific accounts' passwords. This bypass allows unlimited requests against unauthenticated endpoints. Version 2.2.0 patches the issue.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3,"severity":null}],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-m547-hp4w-j6jx","https://vikunja.io/changelog/vikunja-v2.2.0-was-released"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-13706","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Mar 20, 2026, 2:39:59 PM","dateUpdated":"Mar 20, 2026, 5:15:23 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-13706","identifiers":["EUVD-2026-13706","CVE-2026-29794","GHSA-m547-hp4w-j6jx"]},"retained":false,"historicalAffected":[]},{"revision":"e073717168ed41e2928b9c76fe7fe78f","observedAt":"2026-10-25T07:19:08.798+00:00","statement":{"source":"nvd","id":"CVE-2026-29794","aliases":[],"title":"Vikunja is an open-source self-hosted task management platform. Starting in version 0.8 and prior to version 2.2.0, unauthenticated users are able to bypass the application's built-in rate-limits by spoofing the `X-Forwarded-For` or `X-Real…","description":"Vikunja is an open-source self-hosted task management platform. Starting in version 0.8 and prior to version 2.2.0, unauthenticated users are able to bypass the application's built-in rate-limits by spoofing the `X-Forwarded-For` or `X-Real-IP` headers due to the rate-limit relying on the value of `(echo.Context).RealIP`. Unauthenticated users can abuse endpoints available to them for different potential impacts. The immediate concern would be brute-forcing usernames or specific accounts' passwords. This bypass allows unlimited requests against unauthenticated endpoints. Version 2.2.0 patches the issue.","state":0,"publishedAt":"2026-03-20T15:16:16.393+00:00","modifiedAt":"2026-06-17T10:29:54+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-m547-hp4w-j6jx","https://vikunja.io/changelog/vikunja-v2.2.0-was-released"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-29794","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-807"],"productCriteria":["cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-03-20T15:16:16.393","lastModified":"2026-06-17T10:29:54.000"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-29794","identifiers":["CVE-2026-29794"]},"retained":false,"historicalAffected":[]},{"revision":"a6eacaa8202c4f61b62856b8d84f4a0a","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-m547-hp4w-j6jx","aliases":["CVE-2026-29794","GO-2026-4791"],"title":"Vikunja has a Rate-Limit Bypass for Unauthenticated Users via Spoofed Headers","description":"### Summary\nUnauthenticated users are able to bypass the application's built-in rate-limits by spoofing the `X-Forwarded-For` or `X-Real-IP` headers due to the rate-limit relying on the value of `(echo.Context).RealIP`. \n\n### Details\nIn the first file below, the rate-limit for unauthenticated users can be observed being populated with the `ip` value. In the second file, it shows it using the `c.RealIP()` function for the `ip` case. Due to this, the rate-limit will rely on the value of one of the two mentioned headers (`X-Forwarded-For` or `X-Real-IP`). These can be spoofed by users client-side in order to completely bypass any unauthenticated rate-limits in place.\n\nSome reverse proxies like Traefik will overwrite this value by default, but others will not, leaving any deployment that either isn't using a reserve proxy that specifically overwrites the header's value or isn't using a reverse proxy vulnerable. \n\n**File 1:** pkg\\routes\\routes.go:318\n```go\n// This is the group with no auth\n\t// It is its own group to be able to rate limit this based on different heuristics\n\tn := a.Group(\"\")\n\tsetupRateLimit(n, \"ip\")\n\n\t// Docs\n\tn.GET(\"/docs.json\", apiv1.DocsJSON)\n\tn.GET(\"/docs\", apiv1.RedocUI)\n\n\t// Prometheus endpoint\n\tsetupMetrics(n)\n\n\t// Separate route for unauthenticated routes to enable rate limits for it\n\tur := a.Group(\"\")\n\trate := limiter.Rate{\n\t\tPeriod: 60 * time.Second,\n\t\tLimit:  config.RateLimitNoAuthRoutesLimit.GetInt64(),\n\t}\n\trateLimiter := createRateLimiter(rate)\n\tur.Use(RateLimit(rateLimiter, \"ip\"))\n```\n**File 2:** pkg\\routes\\rate_limit.go:41\n```go\n// RateLimit is the rate limit middleware\nfunc RateLimit(rateLimiter *limiter.Limiter, rateLimitKind string) echo.MiddlewareFunc {\n\treturn func(next echo.HandlerFunc) echo.HandlerFunc {\n\t\treturn func(c *echo.Context) (err error) {\n\t\t\tvar rateLimitKey string\n\t\t\tswitch rateLimitKind {\n\t\t\tcase \"ip\":\n\t\t\t\trateLimitKey = c.RealIP()\n\t\t\tcase \"user\":\n\t\t\t\tauth, err := auth2.GetAuthFromClaims(c)\n\t\t\t\tif err != nil {\n\t\t\t\t\tlog.Errorf(\"Error getting auth from jwt claims: %v\", err)\n\t\t\t\t}\n\t\t\t\trateLimitKey = \"user_\" + strconv.FormatInt(auth.GetID(), 10)\n\t\t\tdefault:\n\t\t\t\tlog.Errorf(\"Unknown rate limit kind configured: %s\", rateLimitKind)\n\t\t\t}\n```\n\n### PoC\n1. Download and run the default docker compose file via the instructions here: [https://vikunja.io/install/](https://vikunja.io/install/). Do not configure a proxy.\n2. Once running, navigate to the application in a web browser that is using a web proxy, such as Burp Suite.\n3. Attempt to authenticate to the application with an invalid username and password.\n4. In the web proxy's logs, locate the request to the `/api/v1/login` endpoint. Observe that the response contains rate-limit details:\n```http\nHTTP/1.1 403 Forbidden\nCache-Control: no-store\nContent-Type: application/json\nVary: Origin\nX-Ratelimit-Limit: 10\nX-Ratelimit-Remaining: 9\nX-Ratelimit-Reset: 1772224455\nDate: Fri, 27 Feb 2026 20:33:16 GMT\nContent-Length: 54\n\n{\"code\":1011,\"message\":\"Wrong username or password.\"}\n```\n5. Add the `X-Forwarded-For` header with an arbitrary value, like so: `X-Forwarded-For: FakeValue`. Send the request 10 times, or until the rate-limit is at zero.\n6. Modify the `X-Forwarded-For` headers value to be different, like so: `X-Forwarded-For: NewValue`.\n7. Observe that the `X-Ratelimit-Remaining` header's value has reset its countdown and is back at `9`. \n\n### Impact\nUnauthenticated users can abuse endpoints available to them for different potential impacts. The immediate concern would be brute-forcing usernames or specific accounts' passwords. This bypass allows unlimited requests against unauthenticated endpoints.","state":0,"publishedAt":"2026-03-20T14:41:03+00:00","modifiedAt":"2026-09-10T03:51:00.5965814+00:00","affected":[{"ecosystem":"Go","name":"code.vikunja.io/api","ranges":[{"type":"ECOSYSTEM","events":[{"kind":"introduced","version":"0.8"},{"kind":"fixed","version":"2.2.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-m547-hp4w-j6jx","https://nvd.nist.gov/vuln/detail/CVE-2026-29794","https://github.com/go-vikunja/vikunja/commit/a498dd69915a006c07e9d82660a2185d7e8136ee","https://github.com/go-vikunja/vikunja","https://vikunja.io/changelog/vikunja-v2.2.0-was-released"],"sourceUrl":"https://github.com/advisories/GHSA-m547-hp4w-j6jx","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-m547-hp4w-j6jx","identifiers":["GHSA-m547-hp4w-j6jx","CVE-2026-29794","GO-2026-4791"]},"retained":false,"historicalAffected":[]},{"revision":"9b1946e412f84680a8d07ecbb9d6dce6","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-4791","aliases":["CVE-2026-29794","GHSA-m547-hp4w-j6jx"],"title":"Vikunja has a Rate-Limit Bypass for Unauthenticated Users via Spoofed Headers in code.vikunja.io/api","description":"Vikunja has a Rate-Limit Bypass for Unauthenticated Users via Spoofed Headers in code.vikunja.io/api.\n\nNOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.\n\n(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)\n\nThe additional affected modules and versions are: code.vikunja.io/api from v0.8.0 before v2.2.0.","state":0,"publishedAt":"2026-03-23T18:16:14+00:00","modifiedAt":"2026-03-23T18:45:23.094536+00:00","affected":[{"ecosystem":"Go","name":"code.vikunja.io/api","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-m547-hp4w-j6jx","https://nvd.nist.gov/vuln/detail/CVE-2026-29794","https://github.com/go-vikunja/vikunja/commit/a498dd69915a006c07e9d82660a2185d7e8136ee","https://vikunja.io/changelog/vikunja-v2.2.0-was-released"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-4791","license":"OSV · upstream source license applies","key":"osv:GO-2026-4791","identifiers":["GO-2026-4791","CVE-2026-29794","GHSA-m547-hp4w-j6jx"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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