CVE-2026-26928 (GCVE-0-2026-26928)
Vulnerability from cvelistv5 – Published: 2026-04-02 14:01 – Updated: 2026-04-02 14:21
VLAI?
Title
Lack of Dynamic Library Validation in SzafirHost
Summary
SzafirHost downloads necessary files in the context of the initiating web page. When called, SzafirHost updates its dynamic library. JAR files are correctly verified based on a list of trusted file hashes, and if a file was not on that list, it was checked to see if it had been digitally signed by the vendor. The application doesn't verify hash or vendor's digital signature of uploaded DLL, SO, JNILIB or DYLIB file. The attacker can provide malicious file which will be saved in users /temp folder and executed by the application.
This issue was fixed in version 1.1.0.
Severity ?
CWE
- CWE-354 - Improper Validation of Integrity Check Value
Assigner
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Krajowa Izba Rozliczeniowa | SzafirHost |
Affected:
0 , < 1.1.0
(semver)
|
Credits
Michał Leszczyński
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-26928",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-02T14:21:35.804676Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-02T14:21:50.711Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "SzafirHost",
"vendor": "Krajowa Izba Rozliczeniowa",
"versions": [
{
"lessThan": "1.1.0",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Micha\u0142 Leszczy\u0144ski"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "SzafirHost\u0026nbsp;downloads necessary files in the context of the \u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003einitiating web page.\u003c/span\u003e\u0026nbsp;When called, SzafirHost updates its dynamic library. JAR files are correctly verified based on a list of trusted file hashes, and if a file was not on that list, it was checked to see if it had been digitally signed by the vendor. The application doesn\u0027t verify hash or vendor\u0027s digital signature of uploaded\u0026nbsp;\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eDLL, SO, JNILIB or DYLIB\u003c/span\u003e file. The attacker can provide malicious file which will be saved in users /temp folder\u0026nbsp;\u003cspan style=\"background-color: rgba(221, 223, 228, 0.04);\"\u003eand executed by the application.\u003c/span\u003e\u003cbr\u003e\u003cbr\u003eThis issue was fixed in version 1.1.0."
}
],
"value": "SzafirHost\u00a0downloads necessary files in the context of the initiating web page.\u00a0When called, SzafirHost updates its dynamic library. JAR files are correctly verified based on a list of trusted file hashes, and if a file was not on that list, it was checked to see if it had been digitally signed by the vendor. The application doesn\u0027t verify hash or vendor\u0027s digital signature of uploaded\u00a0DLL, SO, JNILIB or DYLIB file. The attacker can provide malicious file which will be saved in users /temp folder\u00a0and executed by the application.\n\nThis issue was fixed in version 1.1.0."
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.7,
"baseSeverity": "HIGH",
"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:N/VI:H/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "HIGH",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-354",
"description": "CWE-354 Improper Validation of Integrity Check Value",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-02T14:01:42.262Z",
"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
"shortName": "CERT-PL"
},
"references": [
{
"tags": [
"third-party-advisory"
],
"url": "https://cert.pl/posts/2026/04/CVE-2026-26927"
},
{
"tags": [
"product"
],
"url": "https://www.elektronicznypodpis.pl/"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Lack of Dynamic Library Validation in SzafirHost",
"x_generator": {
"engine": "Vulnogram 0.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
"assignerShortName": "CERT-PL",
"cveId": "CVE-2026-26928",
"datePublished": "2026-04-02T14:01:42.262Z",
"dateReserved": "2026-02-16T09:01:03.143Z",
"dateUpdated": "2026-04-02T14:21:50.711Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-26928",
"date": "2026-04-15",
"epss": "0.00025",
"percentile": "0.06843"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-26928\",\"sourceIdentifier\":\"cvd@cert.pl\",\"published\":\"2026-04-02T14:16:26.077\",\"lastModified\":\"2026-04-03T16:10:52.680\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"SzafirHost\u00a0downloads necessary files in the context of the initiating web page.\u00a0When called, SzafirHost updates its dynamic library. JAR files are correctly verified based on a list of trusted file hashes, and if a file was not on that list, it was checked to see if it had been digitally signed by the vendor. The application doesn\u0027t verify hash or vendor\u0027s digital signature of uploaded\u00a0DLL, SO, JNILIB or DYLIB file. The attacker can provide malicious file which will be saved in users /temp folder\u00a0and executed by the application.\\n\\nThis issue was fixed in version 1.1.0.\"}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"cvd@cert.pl\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/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\",\"baseScore\":8.7,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"HIGH\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}]},\"weaknesses\":[{\"source\":\"cvd@cert.pl\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-354\"}]}],\"references\":[{\"url\":\"https://cert.pl/posts/2026/04/CVE-2026-26927\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://www.elektronicznypodpis.pl/\",\"source\":\"cvd@cert.pl\"}]}}",
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-26928\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-02T14:21:35.804676Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-02T14:21:42.248Z\"}}], \"cna\": {\"title\": \"Lack of Dynamic Library Validation in SzafirHost\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Micha\\u0142 Leszczy\\u0144ski\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 8.7, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"HIGH\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Krajowa Izba Rozliczeniowa\", \"product\": \"SzafirHost\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"1.1.0\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://cert.pl/posts/2026/04/CVE-2026-26927\", \"tags\": [\"third-party-advisory\"]}, {\"url\": \"https://www.elektronicznypodpis.pl/\", \"tags\": [\"product\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"SzafirHost\\u00a0downloads necessary files in the context of the initiating web page.\\u00a0When called, SzafirHost updates its dynamic library. JAR files are correctly verified based on a list of trusted file hashes, and if a file was not on that list, it was checked to see if it had been digitally signed by the vendor. The application doesn\u0027t verify hash or vendor\u0027s digital signature of uploaded\\u00a0DLL, SO, JNILIB or DYLIB file. The attacker can provide malicious file which will be saved in users /temp folder\\u00a0and executed by the application.\\n\\nThis issue was fixed in version 1.1.0.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"SzafirHost\u0026nbsp;downloads necessary files in the context of the \u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003einitiating web page.\u003c/span\u003e\u0026nbsp;When called, SzafirHost updates its dynamic library. JAR files are correctly verified based on a list of trusted file hashes, and if a file was not on that list, it was checked to see if it had been digitally signed by the vendor. The application doesn\u0027t verify hash or vendor\u0027s digital signature of uploaded\u0026nbsp;\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003eDLL, SO, JNILIB or DYLIB\u003c/span\u003e file. The attacker can provide malicious file which will be saved in users /temp folder\u0026nbsp;\u003cspan style=\\\"background-color: rgba(221, 223, 228, 0.04);\\\"\u003eand executed by the application.\u003c/span\u003e\u003cbr\u003e\u003cbr\u003eThis issue was fixed in version 1.1.0.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-354\", \"description\": \"CWE-354 Improper Validation of Integrity Check Value\"}]}], \"providerMetadata\": {\"orgId\": \"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6\", \"shortName\": \"CERT-PL\", \"dateUpdated\": \"2026-04-02T14:01:42.262Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-26928\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-02T14:21:50.711Z\", \"dateReserved\": \"2026-02-16T09:01:03.143Z\", \"assignerOrgId\": \"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6\", \"datePublished\": \"2026-04-02T14:01:42.262Z\", \"assignerShortName\": \"CERT-PL\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
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.
Loading…
Loading…