# CVE-2026-125758: Aptabase before commit 61d4c01 Authentication Bypass via Known Example AUTH_SECRET

Status: published. Published: 2026-11-10. Updated: 2026-11-14.

Aptabase before commit 61d4c01 contains an authentication bypass vulnerability that allows unauthenticated attackers to forge sign-in links by using the publicly known example AUTH_SECRET. Attackers can enumerate registered e-mails via /api/_auth/signin, forge HS256 JWTs redeemed by /api/_auth/continue, impersonate users, export analytics data, and transfer app ownership.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/aptabase/aptabase/commit/61d4c01298a706d575265461ac07bb956ca7b8d2
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/aptabase/aptabase/pull/204
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/aptabase/self-hosting/commit/b79a472419ff17e485d0bd5b4adf1b1ef2b9953c

## Affected products and versions

- aptabase / aptabase (aptabase/aptabase): ≥ 0; < 61d4c01298a706d575265461ac07bb956ca7b8d2 (affected, git). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 9.1 (critical); CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.4 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N; source: CNA: VulnCheck

- CVSS 4.0: 9.1 (critical); CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 7.4 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.34% as of 2026-11-13; percentile 28.18%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-1188

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/aptabase/aptabase/security/advisories/GHSA-gc76-cqm4-vqcf (CNA: VulnCheck; vendor-advisory)

- https://github.com/aptabase/aptabase/commit/61d4c01298a706d575265461ac07bb956ca7b8d2 (CNA: VulnCheck; patch)

- https://github.com/aptabase/aptabase/pull/204 (CNA: VulnCheck; issue-tracking, patch)

- https://github.com/aptabase/self-hosting/commit/b79a472419ff17e485d0bd5b4adf1b1ef2b9953c (CNA: VulnCheck; patch)

- https://www.vulncheck.com/advisories/aptabase-before-commit-61d4c01-authentication-bypass-via-known-example-auth-secret (CNA: VulnCheck; third-party-advisory)

- https://github.com/aptabase/aptabase/commit/61d4c01298a706d575265461ac07bb956ca7b8d2 (disclosure@vulncheck.com)

- https://github.com/aptabase/aptabase/pull/204 (disclosure@vulncheck.com)

- https://github.com/aptabase/aptabase/security/advisories/GHSA-gc76-cqm4-vqcf (disclosure@vulncheck.com)

- https://github.com/aptabase/self-hosting/commit/b79a472419ff17e485d0bd5b4adf1b1ef2b9953c (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/aptabase-before-commit-61d4c01-authentication-bypass-via-known-example-auth-secret (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-125758; retrieved 2026-11-14; source updated 2026-11-14

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-125758; retrieved 2026-11-13; source updated 2026-11-12

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-125758; retrieved 2026-11-14; source updated Not reported

Revision: f50d63d0a776d88e510a64e0a140ba1f2ed85c1066e9e8ae89c0929ad45f944e

Canonical: https://y2.dev/cve/CVE-2026-125758

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.