Vulnerability-Lookup

CVE-2026-80199 (GCVE-0-2026-80199)

Vulnerability from cvelistv5 – Published: 2026-08-25 23:19 – Updated: 2026-08-26 12:12

Title

Kimai before 2.54.0 Username Enumeration via Timing Oracle

Summary

Kimai before 2.54.0 contains a timing oracle vulnerability in TokenAuthenticator that allows unauthenticated attackers to enumerate valid usernames via X-AUTH-USER header. Attackers can measure response time differences when the password hasher runs only for existing users, enabling username enumeration with no login throttling protection.

Severity

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

3.7 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-26 12:07 UTC

CWE

CWE-208 - Observable Timing Discrepancy

Assigner

VulnCheck mitre root

References

2 references

URL	Tags
https://github.com/kimai/kimai/security/advisorie…	vendor-advisory
https://www.vulncheck.com/advisories/kimai-before…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
kimai	kimai	Affected: 0 , < 2.54.0 (semver) Unaffected: 2.54.0 (semver) cpe:2.3:a:kimai:kimai::::::::

Date Public

2026-04-16 00:00

Credits

melnicek

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-80199

Vulnerability from fkie_nvd - Published: 2026-08-26 05:18 - Updated: 2026-08-31 20:52

Severity

3.7 (Low) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/kimai/kimai/security/advisories/GHSA-jrc6-fmhw-fpq2
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/kimai-before-2.54.0-username-enumeration-via-timing-oracle

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "kimai",
          "vendor": "kimai",
          "versions": [
            {
              "lessThan": "2.54.0",
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            },
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            }
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    }
  ],
  "id": "CVE-2026-80199",
  "lastModified": "2026-08-31T20:52:56.343",
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          "modifiedPrivilegesRequired": "NOT_DEFINED",
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}

GHSA-P6F7-72PM-R6J9

Vulnerability from github – Published: 2026-08-31 21:31 – Updated: 2026-08-31 21:31

Details

Severity

3.7 (Low)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

6.3 (Medium)


                  
                    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-80199"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-208"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-26T05:18:27Z",
    "severity": "MODERATE"
  },
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  "id": "GHSA-p6f7-72pm-r6j9",
  "modified": "2026-08-31T21:31:51Z",
  "published": "2026-08-31T21:31:51Z",
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    {
      "type": "WEB",
      "url": "https://github.com/kimai/kimai/security/advisories/GHSA-jrc6-fmhw-fpq2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80199"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/kimai-before-2.54.0-username-enumeration-via-timing-oracle"
    }
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  "schema_version": "1.4.0",
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      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/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",
      "type": "CVSS_V4"
    }
  ]
}

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.

Detection rules are retrieved from Rulezet.

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.

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.

Action not permitted

CVE-2026-80199 (GCVE-0-2026-80199)

FKIE_CVE-2026-80199

GHSA-P6F7-72PM-R6J9

Tags

Sightings

Nomenclature

Related by attack behaviour