# CVE-2026-126658: ByteStash 1.5.10 before 1.6.2 Insufficient Session Expiration via API Keys

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

ByteStash 1.5.10 before 1.6.2 contains an insufficient session expiration vulnerability that allows holders of API keys to keep access after account deactivation because validateApiKey never checks account status. Attackers holding a deactivated account's API key can read, create, modify and delete its snippets via /api/snippets and use every MCP tool via /mcp.

## 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/jordan-dalby/ByteStash/commit/eb4ecdfc30f2e7d1424137fa7fe3a9eed663218b

## Affected products and versions

- jordan-dalby / ByteStash (jordan-dalby/ByteStash): ≥ 1.5.10; < 1.6.2 (affected, semver); 1.6.2 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 5.4 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-613

## Exploit evidence

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

## References

- https://github.com/jordan-dalby/ByteStash/security/advisories/GHSA-26m9-ww2j-3cr5 (CNA: VulnCheck; vendor-advisory)

- https://github.com/jordan-dalby/ByteStash/commit/eb4ecdfc30f2e7d1424137fa7fe3a9eed663218b (CNA: VulnCheck; patch)

- https://github.com/jordan-dalby/ByteStash/releases/tag/v1.6.2 (CNA: VulnCheck; release-notes)

- https://github.com/jordan-dalby/ByteStash/blob/v1.6.1/server/src/repositories/apiKeyRepository.js#L70-L78 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/bytestash-1.5.10-before-1.6.2-insufficient-session-expiration-via-api-keys (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-126658; retrieved 2026-11-11; source updated 2026-11-11

Revision: 2876fd844a18b1736aa99ff1d0467de65e8095c79cf6634170252839229d8afc

Canonical: https://y2.dev/cve/CVE-2026-126658

## 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.