CVE-2026-33667 (GCVE-0-2026-33667)
Vulnerability from cvelistv5 – Published: 2026-04-15 18:43 – Updated: 2026-04-15 20:00
VLAI
EPSS
VEX
Title
OpenProject: 2FA OTP Verification Missing Rate Limiting
Summary
OpenProject is an open-source project management application. In versions prior to 17.3.0, 2FA OTP verification in the confirm_otp action of the two_factor_authentication module has no rate limiting, lockout mechanism, or failed-attempt tracking. The existing brute_force_block_after_failed_logins setting only counts password login failures and does not apply to the 2FA verification stage, and neither the fail_login nor stage_failure methods increment any counter, lock the account, or add any delay. With the default TOTP drift window of ±60 seconds allowing approximately 5 valid codes at any time, an attacker who knows a user's password can brute-force the 6-digit TOTP code at roughly 5-10 attempts per second with an expected completion time of approximately 11 hours. The same vulnerability applies to backup code verification. This effectively allows complete 2FA bypass for any account where the password is known. This issue has been fixed in version 17.3.0.
Severity
7.4 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-15 19:59 UTC
CWE
- CWE-307 - Improper Restriction of Excessive Authentication Attempts
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/opf/openproject/security/advis… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| opf | openproject |
Affected:
< 17.3.0
|
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-33667",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-15T19:59:53.990177Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-15T20:00:14.503Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "openproject",
"vendor": "opf",
"versions": [
{
"status": "affected",
"version": "\u003c 17.3.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "OpenProject is an open-source project management application. In versions prior to 17.3.0, 2FA OTP verification in the confirm_otp action of the two_factor_authentication module has no rate limiting, lockout mechanism, or failed-attempt tracking. The existing brute_force_block_after_failed_logins setting only counts password login failures and does not apply to the 2FA verification stage, and neither the fail_login nor stage_failure methods increment any counter, lock the account, or add any delay. With the default TOTP drift window of \u00b160 seconds allowing approximately 5 valid codes at any time, an attacker who knows a user\u0027s password can brute-force the 6-digit TOTP code at roughly 5-10 attempts per second with an expected completion time of approximately 11 hours. The same vulnerability applies to backup code verification. This effectively allows complete 2FA bypass for any account where the password is known. This issue has been fixed in version 17.3.0."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-307",
"description": "CWE-307: Improper Restriction of Excessive Authentication Attempts",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-15T18:43:14.130Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/opf/openproject/security/advisories/GHSA-234r-45m2-w6cv",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/opf/openproject/security/advisories/GHSA-234r-45m2-w6cv"
}
],
"source": {
"advisory": "GHSA-234r-45m2-w6cv",
"discovery": "UNKNOWN"
},
"title": "OpenProject: 2FA OTP Verification Missing Rate Limiting"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-33667",
"datePublished": "2026-04-15T18:43:14.130Z",
"dateReserved": "2026-03-23T15:23:42.220Z",
"dateUpdated": "2026-04-15T20:00:14.503Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-33667",
"date": "2026-10-30",
"epss": "0.00296",
"percentile": "0.22286"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"product": "openproject",
"vendor": "opf",
"versions": [
{
"status": "affected",
"version": "\u003c 17.3.0"
}
]
}
],
"source": "security-advisories@github.com"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:openproject:openproject:*:*:*:*:*:*:*:*",
"matchCriteriaId": "9C9F05E3-C32E-4932-BFBB-8F3E2D9D4292",
"versionEndExcluding": "17.3.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "OpenProject is an open-source project management application. In versions prior to 17.3.0, 2FA OTP verification in the confirm_otp action of the two_factor_authentication module has no rate limiting, lockout mechanism, or failed-attempt tracking. The existing brute_force_block_after_failed_logins setting only counts password login failures and does not apply to the 2FA verification stage, and neither the fail_login nor stage_failure methods increment any counter, lock the account, or add any delay. With the default TOTP drift window of \u00b160 seconds allowing approximately 5 valid codes at any time, an attacker who knows a user\u0027s password can brute-force the 6-digit TOTP code at roughly 5-10 attempts per second with an expected completion time of approximately 11 hours. The same vulnerability applies to backup code verification. This effectively allows complete 2FA bypass for any account where the password is known. This issue has been fixed in version 17.3.0."
},
{
"lang": "es",
"value": "OpenProject es una aplicaci\u00f3n de gesti\u00f3n de proyectos de c\u00f3digo abierto. En versiones anteriores a la 17.3.0, la verificaci\u00f3n OTP de 2FA en la acci\u00f3n confirm_otp del m\u00f3dulo two_factor_authentication no tiene limitaci\u00f3n de velocidad, mecanismo de bloqueo ni seguimiento de intentos fallidos. La configuraci\u00f3n existente brute_force_block_after_failed_logins solo cuenta los fallos de inicio de sesi\u00f3n por contrase\u00f1a y no se aplica a la etapa de verificaci\u00f3n de 2FA, y ni los m\u00e9todos fail_login ni stage_failure incrementan ning\u00fan contador, bloquean la cuenta o a\u00f1aden ning\u00fan retraso. Con la ventana de deriva TOTP predeterminada de \u00b160 segundos que permite aproximadamente 5 c\u00f3digos v\u00e1lidos en cualquier momento, un atacante que conoce la contrase\u00f1a de un usuario puede forzar por fuerza bruta el c\u00f3digo TOTP de 6 d\u00edgitos a aproximadamente 5-10 intentos por segundo con un tiempo de finalizaci\u00f3n esperado de aproximadamente 11 horas. La misma vulnerabilidad se aplica a la verificaci\u00f3n de c\u00f3digos de respaldo. Esto permite efectivamente la omisi\u00f3n completa de 2FA para cualquier cuenta donde la contrase\u00f1a sea conocida. Este problema ha sido solucionado en la versi\u00f3n 17.3.0."
}
],
"id": "CVE-2026-33667",
"lastModified": "2026-10-26T22:10:00.163",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 5.2,
"source": "security-advisories@github.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-33667",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-15T19:59:53.990177Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-04-15T19:16:35.603",
"references": [
{
"source": "security-advisories@github.com",
"tags": [
"Exploit",
"Mitigation",
"Vendor Advisory"
],
"url": "https://github.com/opf/openproject/security/advisories/GHSA-234r-45m2-w6cv"
}
],
"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-307"
}
],
"source": "security-advisories@github.com",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"current_release_date": "2026-06-05T19:17:13+00:00",
"cve": "CVE-2026-33667",
"id": "CVE-2026-33667",
"initial_release_date": "2026-01-01T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "OpenProject: 2FA OTP Verification Missing Rate Limiting",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33667.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-33667",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-15T19:59:53.990177Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-15T20:00:04.898Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "openproject",
"vendor": "opf",
"versions": [
{
"status": "affected",
"version": "\u003c 17.3.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "OpenProject is an open-source project management application. In versions prior to 17.3.0, 2FA OTP verification in the confirm_otp action of the two_factor_authentication module has no rate limiting, lockout mechanism, or failed-attempt tracking. The existing brute_force_block_after_failed_logins setting only counts password login failures and does not apply to the 2FA verification stage, and neither the fail_login nor stage_failure methods increment any counter, lock the account, or add any delay. With the default TOTP drift window of \u00b160 seconds allowing approximately 5 valid codes at any time, an attacker who knows a user\u0027s password can brute-force the 6-digit TOTP code at roughly 5-10 attempts per second with an expected completion time of approximately 11 hours. The same vulnerability applies to backup code verification. This effectively allows complete 2FA bypass for any account where the password is known. This issue has been fixed in version 17.3.0."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-307",
"description": "CWE-307: Improper Restriction of Excessive Authentication Attempts",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-15T18:43:14.130Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/opf/openproject/security/advisories/GHSA-234r-45m2-w6cv",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/opf/openproject/security/advisories/GHSA-234r-45m2-w6cv"
}
],
"source": {
"advisory": "GHSA-234r-45m2-w6cv",
"discovery": "UNKNOWN"
},
"title": "OpenProject: 2FA OTP Verification Missing Rate Limiting"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-33667",
"datePublished": "2026-04-15T18:43:14.130Z",
"dateReserved": "2026-03-23T15:23:42.220Z",
"dateUpdated": "2026-04-15T20:00:14.503Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
Loading timeline…
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.