# CVE-2026-121413: Parse Server before 8.6.112 and 9.0.0 before 9.10.6-alpha.4 Session Permission Bypass via upgradeToRevocableSession

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

Parse Server before 8.6.112 and 9.0.0 before 9.10.6-alpha.4 contains an authorization bypass in the session upgrade endpoint, which creates a new session for any valid session token without enforcing the _Session class create class-level permission. Attackers holding a user's session token can send an already revocable token to /upgradeToRevocableSession to obtain additional sessions with fresh expiration that persist after the original session is logged out.

## 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/parse-community/parse-server/pull/10808
- 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/parse-community/parse-server/pull/10809

## Affected products and versions

- parse-community / parse-server (parse-server): ≥ 9.0.0; < 9.10.6-alpha.4 (affected, semver); 9.10.6-alpha.4 (unaffected, semver). Source: CNA: VulnCheck
- parse-community / parse-server (parse-server): ≥ 0; < 8.6.112 (affected, semver); 8.6.112 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 2.3 (low); CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

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

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-863

## Exploit evidence

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

## References

- https://github.com/parse-community/parse-server/security/advisories/GHSA-2j2x-c587-q33g (CNA: VulnCheck; vendor-advisory)

- https://github.com/parse-community/parse-server/pull/10808 (CNA: VulnCheck; patch, issue-tracking)

- https://github.com/parse-community/parse-server/pull/10809 (CNA: VulnCheck; patch, issue-tracking)

- https://www.vulncheck.com/advisories/parse-server-before-8.6.112-and-9.0.0-before-9.10.6-alpha.4-session-permission-bypass-via-upgradetorevocablesession (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-121413; retrieved 2026-11-03; source updated 2026-11-03

Revision: 0855053ece5f13dab3ee0bcae9e7651e2ef12bb1b953f3409fbc96be1e95833f

Canonical: https://y2.dev/cve/CVE-2026-121413

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