CVE-2025-66303 (GCVE-0-2025-66303)
Vulnerability from cvelistv5 – Published: 2025-12-01 21:35 – Updated: 2025-12-03 15:10
VLAI
EPSS
VEX
Title
Grav is vulnerable to a DOS on the admin panel
Summary
Grav is a file-based Web platform. Prior to 1.8.0-beta.27, A Denial of Service (DoS) vulnerability has been identified in Grav related to the handling of scheduled_at parameters. Specifically, the application fails to properly sanitize input for cron expressions. By manipulating the scheduled_at parameter with a malicious input, such as a single quote, the application admin panel becomes non-functional, causing significant disruptions to administrative operations. The only way to recover from this issue is to manually access the host server and modify the backup.yaml file to correct the corrupted cron expression. This vulnerability is fixed in 1.8.0-beta.27.
Severity
4.9 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-03 15:10 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/getgrav/grav/security/advisori… | x_refsource_CONFIRM |
| https://github.com/getgrav/grav/commit/9d11094e41… | x_refsource_MISC |
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CNVD-2025-30355
Vulnerability from cnvd - Published: 2025-12-09
VLAI
Title
Grav资源管理错误漏洞
Description
Grav是一套可扩展的用于个人博客、小型内容发布平台和单页产品展示的CMS（内容管理系统）。
Grav存在资源管理错误漏洞，该漏洞源于输入清理不足，攻击者可利用该漏洞导致拒绝服务。
Severity
中
Patch Name
Grav资源管理错误漏洞的补丁
Patch Description
Grav是一套可扩展的用于个人博客、小型内容发布平台和单页产品展示的CMS（内容管理系统）。
Grav存在资源管理错误漏洞，该漏洞源于输入清理不足，攻击者可利用该漏洞导致拒绝服务。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。
Formal description
目前厂商已发布升级程序修复该安全问题，详情见厂商官网: https://getgrav.org/downloads
Reference
https://github.com/getgrav/grav/commit/9d11094e4133f059688fad1e00dbe96fb6e3ead7
Impacted products
| Name | Grav Grav <1.8.0-beta.27 |
|---|
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"description": "Grav\u662f\u4e00\u5957\u53ef\u6269\u5c55\u7684\u7528\u4e8e\u4e2a\u4eba\u535a\u5ba2\u3001\u5c0f\u578b\u5185\u5bb9\u53d1\u5e03\u5e73\u53f0\u548c\u5355\u9875\u4ea7\u54c1\u5c55\u793a\u7684CMS\uff08\u5185\u5bb9\u7ba1\u7406\u7cfb\u7edf\uff09\u3002\n\nGrav\u5b58\u5728\u8d44\u6e90\u7ba1\u7406\u9519\u8bef\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u8f93\u5165\u6e05\u7406\u4e0d\u8db3\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\u3002",
"formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u53d1\u5e03\u5347\u7ea7\u7a0b\u5e8f\u4fee\u590d\u8be5\u5b89\u5168\u95ee\u9898\uff0c\u8be6\u60c5\u89c1\u5382\u5546\u5b98\u7f51:\r\nhttps://getgrav.org/downloads",
"isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
"number": "CNVD-2025-30355",
"openTime": "2025-12-09",
"patchDescription": "Grav\u662f\u4e00\u5957\u53ef\u6269\u5c55\u7684\u7528\u4e8e\u4e2a\u4eba\u535a\u5ba2\u3001\u5c0f\u578b\u5185\u5bb9\u53d1\u5e03\u5e73\u53f0\u548c\u5355\u9875\u4ea7\u54c1\u5c55\u793a\u7684CMS\uff08\u5185\u5bb9\u7ba1\u7406\u7cfb\u7edf\uff09\u3002\r\n\r\nGrav\u5b58\u5728\u8d44\u6e90\u7ba1\u7406\u9519\u8bef\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u8f93\u5165\u6e05\u7406\u4e0d\u8db3\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
"patchName": "Grav\u8d44\u6e90\u7ba1\u7406\u9519\u8bef\u6f0f\u6d1e\u7684\u8865\u4e01",
"products": {
"product": "Grav Grav \u003c1.8.0-beta.27"
},
"referenceLink": "https://github.com/getgrav/grav/commit/9d11094e4133f059688fad1e00dbe96fb6e3ead7",
"serverity": "\u4e2d",
"submitTime": "2025-12-03",
"title": "Grav\u8d44\u6e90\u7ba1\u7406\u9519\u8bef\u6f0f\u6d1e"
}
FKIE_CVE-2025-66303
Vulnerability from fkie_nvd - Published: 2025-12-01 22:15 - Updated: 2026-09-26 00:10
Severity
Summary
Grav is a file-based Web platform. Prior to 1.8.0-beta.27, A Denial of Service (DoS) vulnerability has been identified in Grav related to the handling of scheduled_at parameters. Specifically, the application fails to properly sanitize input for cron expressions. By manipulating the scheduled_at parameter with a malicious input, such as a single quote, the application admin panel becomes non-functional, causing significant disruptions to administrative operations. The only way to recover from this issue is to manually access the host server and modify the backup.yaml file to correct the corrupted cron expression. This vulnerability is fixed in 1.8.0-beta.27.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| getgrav | grav | * | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 | |
| getgrav | grav | 1.8.0 |
{
"affected": [
{
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{
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"vendor": "getgrav",
"versions": [
{
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"version": "\u003c 1.8.0-beta.27"
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Grav is a file-based Web platform. Prior to 1.8.0-beta.27, A Denial of Service (DoS) vulnerability has been identified in Grav related to the handling of scheduled_at parameters. Specifically, the application fails to properly sanitize input for cron expressions. By manipulating the scheduled_at parameter with a malicious input, such as a single quote, the application admin panel becomes non-functional, causing significant disruptions to administrative operations. The only way to recover from this issue is to manually access the host server and modify the backup.yaml file to correct the corrupted cron expression. This vulnerability is fixed in 1.8.0-beta.27."
},
{
"lang": "es",
"value": "Grav es una plataforma web basada en archivos. Versiones anteriores a 1.8.0-beta.27, se ha identificado una vulnerabilidad de denegaci\u00f3n de servicio (DoS) en Grav relacionada con el manejo de los par\u00e1metros \u0027scheduled_at\u0027. Espec\u00edficamente, la aplicaci\u00f3n no logra sanear correctamente la entrada para las expresiones cron. Al manipular el par\u00e1metro \u0027scheduled_at\u0027 con una entrada maliciosa, como una comilla simple, el panel de administraci\u00f3n de la aplicaci\u00f3n deja de funcionar, causando interrupciones significativas en las operaciones administrativas. La \u00fanica forma de recuperarse de este problema es acceder manualmente al servidor host y modificar el archivo \u0027backup.yaml\u0027 para corregir la expresi\u00f3n cron corrupta. Esta vulnerabilidad se corrige en 1.8.0-beta.27."
}
],
"id": "CVE-2025-66303",
"lastModified": "2026-09-26T00:10:00.127",
"metrics": {
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"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 4.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.2,
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}
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{
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},
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],
"role": "CISA Coordinator",
"timestamp": "2025-12-03T15:10:29.097271Z",
"version": "2.0.3"
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"published": "2025-12-01T22:15:49.913",
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"url": "https://github.com/getgrav/grav/commit/9d11094e4133f059688fad1e00dbe96fb6e3ead7"
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],
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}
GHSA-X62Q-P736-3997
Vulnerability from github – Published: 2025-12-02 00:36 – Updated: 2025-12-02 00:36
VLAI
Summary
Grav is vulnerable to a DOS on the admin panel
Details
DOS on the admin panel
Severity Rating: Medium
Vector: Denial Of Service
CVE: XXX
CWE: 400 - Uncontrolled Resource Consumption
CVSS Score: 4.9
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Analysis
A Denial of Service (DoS) vulnerability has been identified in the application related to the handling of scheduled_at parameters. Specifically, the application fails to properly sanitize input for cron expressions. By manipulating the scheduled_at parameter with a malicious input, such as a single quote, the application admin panel becomes non-functional, causing significant disruptions to administrative operations.
The only way to recover from this issue is to manually access the host server and modify the backup.yaml file to correct the corrupted cron expression
Proof of Concept
1) Change the value of scheduled_at parameter to ' as shown in the following figures at the http://127.0.0.1/admin/tools endpoint, and observe the response in the second figure:
Figure: Http request on tool endpoint
Figure: Http response on tool endpoint
2) When trying to access the admin panel, the panel is broken as shown in the following figure. Additionally, the value change is reflected in the backup.yaml file, as shown in the second figure:
Figure: Error message view
Figure: Backup.yaml file
Workarounds
No workaround is currently known
Timeline
2024-07-24 Issue identified
2024-09-27 Vendor contacted
About X41 D-Sec GmbH
X41 is an expert provider for application security services. Having extensive industry experience and expertise in the area of information security, a strong core security team of world class security experts enables X41 to perform premium security services.
Fields of expertise in the area of application security are security centered code reviews, binary reverse engineering and vulnerability discovery. Custom research and IT security consulting and support services are core competencies of X41.
Severity
4.9 (Medium)
{
"affected": [
{
"package": {
"ecosystem": "Packagist",
"name": "getgrav/grav"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.8.0-beta.27"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2025-66303"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2025-12-02T00:36:59Z",
"nvd_published_at": "2025-12-01T22:15:49Z",
"severity": "MODERATE"
},
"details": "# DOS on the admin panel\n**Severity Rating:** Medium \n\n**Vector:** Denial Of Service\n\n**CVE:** XXX\n\n**CWE:** 400 - Uncontrolled Resource Consumption\n\n**CVSS Score:** 4.9\n\n**CVSS Vector:** CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H\n\n## Analysis\n\nA Denial of Service (DoS) vulnerability has been identified in the application related to the handling of `scheduled_at` parameters. Specifically, the application fails to properly sanitize input for cron expressions. By manipulating the `scheduled_at` parameter with a malicious input, such as a single quote, the application admin panel becomes non-functional, causing significant disruptions to administrative operations.\n\nThe only way to recover from this issue is to manually access the host server and modify the `backup.yaml` file to correct the corrupted cron expression\n\n## Proof of Concept\n\n1) Change the value of `scheduled_at` parameter to `\u0027` as shown in the following figures at the `http://127.0.0.1/admin/tools` endpoint, and observe the response in the second figure:\n \n *Figure: Http request on tool endpoint*\n\n *Figure: Http response on tool endpoint*\n\n2) When trying to access the admin panel, the panel is broken as shown in the following figure. Additionally, the value change is reflected in the `backup.yaml` file, as shown in the second figure:\n \n *Figure: Error message view*\n\n *Figure: Backup.yaml file*\n\n\n## Workarounds\nNo workaround is currently known\n\n# Timeline\n**2024-07-24** Issue identified\n\n**2024-09-27** Vendor contacted\n\n\n# About X41 D-Sec GmbH\nX41 is an expert provider for application security services.\nHaving extensive industry experience and expertise in the area of information\nsecurity, a strong core security team of world class security experts enables\nX41 to perform premium security services.\n\nFields of expertise in the area of application security are security centered\ncode reviews, binary reverse engineering and vulnerability discovery.\nCustom research and IT security consulting and support services are core\ncompetencies of X41.",
"id": "GHSA-x62q-p736-3997",
"modified": "2025-12-02T00:36:59Z",
"published": "2025-12-02T00:36:59Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/getgrav/grav/security/advisories/GHSA-x62q-p736-3997"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66303"
},
{
"type": "WEB",
"url": "https://github.com/getgrav/grav/commit/9d11094e4133f059688fad1e00dbe96fb6e3ead7"
},
{
"type": "PACKAGE",
"url": "https://github.com/getgrav/grav"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Grav is vulnerable to a DOS on the admin panel"
}
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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.
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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.
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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.
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