Parse Server MFA recovery codes not consumed after use
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.7 and 8.6.33, when multi-factor authentication (MFA) via TOTP is enabled for a user account, Parse Server generates two single-use recovery codes. These codes are intended as a fallback when the user cannot provide a TOTP token. However, recovery codes are not consumed after use, allowing the same recovery code to be used an unlimited number of times. This defeats the single-use design of recovery codes and weakens the security of MFA-protected accounts. An attacker who obtains a single recovery code can repeatedly authenticate as the affected user without the code ever being invalidated. This vulnerability is fixed in 9.6.0-alpha.7 and 8.6.33.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-31875
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 18:13 UTC · Revision 1
Source evidence
Parse Server MFA recovery codes not consumed after use
core-osv · Original sourcePublished 11 Mar 2026, 18:04 UTC
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.7 and 8.6.33, when multi-factor authentication (MFA) via TOTP is enabled for a user account, Parse Server generates two single-use recovery codes. These codes are intended as a fallback when the user cannot provide a TOTP token. However, recovery codes are not consumed after use, allowing the same recovery code to be used an unlimited number of times. This defeats the single-use design of recovery codes and weakens the security of MFA-protected accounts. An attacker who obtains a single recovery code can repeatedly authenticate as the affected user without the code ever being invalidated. This vulnerability is fixed in 9.6.0-alpha.7 and 8.6.33.
osv:CVE-2026-31875
Complete source record
{
"id": "f3d4bc74e0f751ded6edb95e0285e5ca13a34603c465ddfa5bfc817f7470ff7e",
"url": "https://osv.dev/vulnerability/CVE-2026-31875",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Parse Server MFA recovery codes not consumed after use",
"summary": "Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.7 and 8.6.33, when multi-factor authentication (MFA) via TOTP is enabled for a user account, Parse Server generates two single-use recovery codes. These codes are intended as a fallback when the user cannot provide a TOTP token. However, recovery codes are not consumed after use, allowing the same recovery code to be used an unlimited number of times. This defeats the single-use design of recovery codes and weakens the security of MFA-protected accounts. An attacker who obtains a single recovery code can repeatedly authenticate as the affected user without the code ever being invalidated. This vulnerability is fixed in 9.6.0-alpha.7 and 8.6.33.",
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"modified": "2026-10-28T02:30:22.127556176Z",
"provider": "osv",
"references": [
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"https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.7",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31875.json",
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"source_id": "core-osv",
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"published_at": "2026-03-11T18:04:55.7+00:00"
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