{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-129483", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-11-15T13:41:10.001Z", "datePublished": "2026-11-15T13:47:23.552Z", "dateUpdated": "2026-11-15T13:47:23.552Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-11-15T13:47:23.552Z"}, "datePublic": "2026-07-31T00:00:00.000Z", "title": "Cyrus SASL through 2.1.28 SRP Authentication Bypass via plugins/srp.c", "descriptions": [{"lang": "en", "value": "Cyrus SASL through 2.1.28 contains an authentication bypass vulnerability in the SRP server mechanism because srp_server_mech_step2 does not reject client public values A that are multiples of N. Unauthenticated network clients can send A equal to N to force a zero shared secret, authenticating as any existing user without the password and learning session keys."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improper Authentication", "cweId": "CWE-287", "type": "CWE"}]}], "affected": [{"vendor": "cyrusimap", "product": "cyrus-sasl", "defaultStatus": "unaffected", "versions": [{"version": "0", "lessThanOrEqual": "2.1.28", "status": "affected", "versionType": "semver"}], "packageURL": "pkg:github/cyrusimap/cyrus-sasl", "repo": "https://github.com/cyrusimap/cyrus-sasl"}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:cyrusimap:cyrus-sasl:*:*:*:*:*:*:*:*", "versionEndIncluding": "2.1.28"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 9.3, "baseSeverity": "CRITICAL"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL"}}], "references": [{"url": "https://github.com/cyrusimap/cyrus-sasl/issues/896", "tags": ["issue-tracking"]}, {"url": "https://seclists.org/oss-sec/2026/q4/122", "tags": ["mailing-list"]}, {"url": "https://gist.github.com/afldl/18d15d3f5a1df99411e35000c7de80db", "tags": ["exploit"]}, {"url": "https://github.com/cyrusimap/cyrus-sasl/commit/fb3724f43dc50247ff2bf02135457d6d77031654", "tags": ["patch"]}, {"url": "https://github.com/cyrusimap/cyrus-sasl/blob/cyrus-sasl-2.1.28/plugins/srp.c#L2046-L2050", "tags": ["technical-description"]}, {"name": "VulnCheck Advisory: Cyrus SASL through 2.1.28 SRP Authentication Bypass via plugins/srp.c", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/cyrus-sasl-through-2.1.28-srp-authentication-bypass-via-plugins-srp-c"}], "credits": [{"lang": "en", "value": "afldl", "type": "finder"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "packageURL": "pkg:github/cyrusimap/cyrus-sasl", "product": "cyrus-sasl", "repo": "https://github.com/cyrusimap/cyrus-sasl", "vendor": "cyrusimap", "versions": [{"lessThanOrEqual": "2.1.28", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Cyrus SASL through 2.1.28 contains an authentication bypass vulnerability in the SRP server mechanism because srp_server_mech_step2 does not reject client public values A that are multiples of N. Unauthenticated network clients can send A equal to N to force a zero shared secret, authenticating as any existing user without the password and learning session keys."}], "id": "CVE-2026-129483", "lastModified": "2026-11-15T14:17:27.530", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "[email protected]", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "[email protected]", "type": "Secondary"}]}, "published": "2026-11-15T14:17:27.530", "references": [{"source": "[email protected]", "url": "https://gist.github.com/afldl/18d15d3f5a1df99411e35000c7de80db"}, {"source": "[email protected]", "url": "https://github.com/cyrusimap/cyrus-sasl/blob/cyrus-sasl-2.1.28/plugins/srp.c#L2046-L2050"}, {"source": "[email protected]", "url": "https://github.com/cyrusimap/cyrus-sasl/commit/fb3724f43dc50247ff2bf02135457d6d77031654"}, {"source": "[email protected]", "url": "https://github.com/cyrusimap/cyrus-sasl/issues/896"}, {"source": "[email protected]", "url": "https://seclists.org/oss-sec/2026/q4/122"}, {"source": "[email protected]", "url": "https://www.vulncheck.com/advisories/cyrus-sasl-through-2.1.28-srp-authentication-bypass-via-plugins-srp-c"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}], "source": "[email protected]", "type": "Primary"}]}

{}

{}