CVE-2026-2878 (GCVE-0-2026-2878)
Vulnerability from cvelistv5 – Published: 2026-02-25 14:45 – Updated: 2026-02-27 17:06
VLAI
EPSS
VEX
Title
Insufficient Entropy Vulnerability in Telerik UI for ASP.NET AJAX
Summary
In Progress® Telerik® UI for AJAX, versions prior to 2026.1.225, an insufficient entropy vulnerability exists in RadAsyncUpload, where a predictable temporary identifier, based on timestamp and filename, can enable collisions and file content tampering.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-27 17:06 UTC
CWE
- CWE-331 - Insufficient Entropy
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.telerik.com/products/aspnet-ajax/docu… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Progress Software | Telerik UI for ASP.NET AJAX |
Affected:
2011.2.712 , < 2026.1.225
(custom)
|
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-2878",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-02-27T17:06:09.729072Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-02-27T17:06:16.616Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Telerik UI for ASP.NET AJAX",
"vendor": "Progress Software",
"versions": [
{
"lessThan": "2026.1.225",
"status": "affected",
"version": "2011.2.712",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Monetary Authority of Singapore"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "In Progress\u00ae Telerik\u00ae UI for AJAX, versions prior to 2026.1.225, an insufficient entropy vulnerability exists in RadAsyncUpload, where a predictable temporary identifier, based on timestamp and filename, can enable collisions and file content tampering."
}
],
"value": "In Progress\u00ae Telerik\u00ae UI for AJAX, versions prior to 2026.1.225, an insufficient entropy vulnerability exists in RadAsyncUpload, where a predictable temporary identifier, based on timestamp and filename, can enable collisions and file content tampering."
}
],
"impacts": [
{
"capecId": "CAPEC-149",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-149 Explore for Predictable Temporary File Names"
}
]
},
{
"capecId": "CAPEC-26",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-26 Leveraging Race Conditions"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-331",
"description": "CWE-331 Insufficient Entropy",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-02-25T14:45:11.142Z",
"orgId": "f9fea0b6-671e-4eea-8fde-31911902ae05",
"shortName": "ProgressSoftware"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-insufficient-entropy-cve-2026-2878"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Insufficient Entropy Vulnerability in Telerik UI for ASP.NET AJAX",
"x_generator": {
"engine": "Vulnogram 0.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "f9fea0b6-671e-4eea-8fde-31911902ae05",
"assignerShortName": "ProgressSoftware",
"cveId": "CVE-2026-2878",
"datePublished": "2026-02-25T14:45:11.142Z",
"dateReserved": "2026-02-20T16:20:51.770Z",
"dateUpdated": "2026-02-27T17:06:16.616Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-2878",
"date": "2026-09-24",
"epss": "0.00303",
"percentile": "0.20422"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Telerik UI for ASP.NET AJAX",
"vendor": "Progress Software",
"versions": [
{
"lessThan": "2026.1.225",
"status": "affected",
"version": "2011.2.712",
"versionType": "custom"
}
]
}
],
"source": "security@progress.com"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:progress:telerik_ui_for_asp.net_ajax:*:*:*:*:*:*:*:*",
"matchCriteriaId": "2AFBB775-6FF6-4965-9CA9-0BA2F10494F7",
"versionEndExcluding": "2026.1.225",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In Progress\u00ae Telerik\u00ae UI for AJAX, versions prior to 2026.1.225, an insufficient entropy vulnerability exists in RadAsyncUpload, where a predictable temporary identifier, based on timestamp and filename, can enable collisions and file content tampering."
},
{
"lang": "es",
"value": "En Progress\u00ae Telerik\u00ae UI para AJAX, versiones anteriores a 2026.1.225, existe una vulnerabilidad de entrop\u00eda insuficiente en RadAsyncUpload, donde un identificador temporal predecible, basado en la marca de tiempo y el nombre de archivo, puede permitir colisiones y la manipulaci\u00f3n del contenido del archivo."
}
],
"id": "CVE-2026-2878",
"lastModified": "2026-06-17T10:31:56.310",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 1.6,
"impactScore": 3.6,
"source": "security@progress.com",
"type": "Secondary"
},
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-2878",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-02-27T17:06:09.729072Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-02-25T15:20:54.293",
"references": [
{
"source": "security@progress.com",
"tags": [
"Mitigation",
"Vendor Advisory"
],
"url": "https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-insufficient-entropy-cve-2026-2878"
}
],
"sourceIdentifier": "security@progress.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-331"
}
],
"source": "security@progress.com",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"current_release_date": "2026-03-27T07:49:13+00:00",
"cve": "CVE-2026-2878",
"id": "CVE-2026-2878",
"initial_release_date": "2026-01-01T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "Insufficient Entropy Vulnerability in Telerik UI for ASP.NET AJAX",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2878.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-2878",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-02-27T17:06:09.729072Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-02-27T17:06:13.052Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Telerik UI for ASP.NET AJAX",
"vendor": "Progress Software",
"versions": [
{
"lessThan": "2026.1.225",
"status": "affected",
"version": "2011.2.712",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Monetary Authority of Singapore"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "In Progress\u00ae Telerik\u00ae UI for AJAX, versions prior to 2026.1.225, an insufficient entropy vulnerability exists in RadAsyncUpload, where a predictable temporary identifier, based on timestamp and filename, can enable collisions and file content tampering."
}
],
"value": "In Progress\u00ae Telerik\u00ae UI for AJAX, versions prior to 2026.1.225, an insufficient entropy vulnerability exists in RadAsyncUpload, where a predictable temporary identifier, based on timestamp and filename, can enable collisions and file content tampering."
}
],
"impacts": [
{
"capecId": "CAPEC-149",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-149 Explore for Predictable Temporary File Names"
}
]
},
{
"capecId": "CAPEC-26",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-26 Leveraging Race Conditions"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-331",
"description": "CWE-331 Insufficient Entropy",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-02-25T14:45:11.142Z",
"orgId": "f9fea0b6-671e-4eea-8fde-31911902ae05",
"shortName": "ProgressSoftware"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-insufficient-entropy-cve-2026-2878"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Insufficient Entropy Vulnerability in Telerik UI for ASP.NET AJAX",
"x_generator": {
"engine": "Vulnogram 0.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "f9fea0b6-671e-4eea-8fde-31911902ae05",
"assignerShortName": "ProgressSoftware",
"cveId": "CVE-2026-2878",
"datePublished": "2026-02-25T14:45:11.142Z",
"dateReserved": "2026-02-20T16:20:51.770Z",
"dateUpdated": "2026-02-27T17:06:16.616Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
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.
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.
Loading…